Episode Glossary

This article lists down the different terms and phrases used in each episode and its definition.

Term 1: El Psy Congroo
"El Psy Congroo" is the password that Rintarou Okabe uses whenever he ends a phone conversation. However, it is revealed that the supposed conversation he ended did not actually exist because Rintarou usually turns his phone off. The phrase is a possible combination of Greek and Latin meaning "To Harden the Mind". The phrase itself is a reference to the @channel meme "La Yohasoh Steana", and possibly something related to the real world John Titor's codeword, "Tempus edax rerum", meaning "Time, the devourer of all things".

Term 2: "Organization"
This is Okarin's delusional agency involved with Committee of 300. It is supposed to be highly secret group who is sought after by many an opposing organizations, whose secrets would be vital to radical change, which nobody but Okarin cares for. This is the initial irony to the series, as something imaginary becomes all too real.

Term 3: Metal Oopa
Oopa is a character from fictional anime Rai-net Kakeu. The Metal Oopa is one, if not the, rarest of a collectible vending Oopa figure series. While the anime is considered a child's cartoon, some collect the merchandise for their rarity.


 * SPOILER* Later in the series, it is revealed that the Metal Oopa is a key item in world line convergence.


 * SPOILER***Also, OOPA, or OOPArt,  is an acronym for "Out Of Place Artifact", a supposedly futuristic artifact found in an ancient archaeological site. The very existance of OOPArts might be an evidence of time traveling that has happened before.

Term 4: Alpacaman
This alphaca with a man's face is a character of virtual pet video game. A parody of SEGA Dreamcast software Seaman.

Term 5: Hououin Kyouma
The main protagonist of Steins;Gate, Okabe is a self-proclaimed mad scientist and often refers to himself under the alias of Hououin Kyouma, which is also the name he uses to introduce himself to other people. Mayuri and Daru refer to him by the nickname Okarin. He also uses this alias when browsing @channel. The literal translation is "Phoenix-Shrine Madness-of-truth".

Term 6: The Choice of Steins;Gate
This is a phrase used by Okabe to signify the meaning of events, the phrase itself doesn't actually mean anything.

Term 7: Futuristic Gadget #1
"Future Gadget #1 Bit Particle Cannon" is one of the gadgets that Okabe and Daru made, It is nothing more than a Laser-gun shaped TV remote control.

Term 8: Landlord
Mr. Braun, the manager of a small electronics store specialized in Braun tubes and CRT-based televisions is also the property owner of the apartment. It is shown that he does not dislike Okarin, but finds his antics to be very disruptive to the property.

Term 9: Hostage
Explained later on in the series, Mayuri is said to be Okarin's hostage. This is because she was traumatized by her grandmother's death to the point where she would visit her grave daily during younger years. One day, Mayuri reaches up towards the sky to a beam of light, and Okarin runs to hold her as he announces that he won't let her go anywhere because she is his hostage - he was afraid she would be taken into the heavens and she would not be with him. It's a non-affectionate way of saying he will never have him leave her if he can help it.

Term 10: Phonewave (Name Subject to Change)
Future Gadget #8. This is actually the full name of the machine used for the initial time-travel related plot in the begining of the series. When a message is sent to the microwave from a phone, it activates it remotely - how convenient! Originally designed to be a remote controlled microwave, this became the base concept for the time machine later on.

Term 11: Gel Banana
During experimentation with the Phone Microwave (Name Subject to Change), a banana is teleported back to it's stalk in the form of a Gel Banana, marking the begining of the time-themed plot.

Term 12: University Forum
Both Rintarou and Itaru are students from Tokyo Denki University, and to acquire academic units, they held a seminar on the Akihabara Techno Forum (ATF) at Dai-Building.

Term 1: SCIENCY
SCIENCY (a parody of SCIENCE) is the most famous scientific journal magazine in the world and is the academic journal of the American Association for the Advancement of Science. At the young age of 18, Kurisu Makise's academic paper was published in this magazine April 2010 issue, making her the youngest person to perform such a feat.

Term 2: Yanagibayashi Shrine 柳林神社
This is the shrine that Ruka helps manage.

Term 3: Youtou Samidare
Replica of Katana sold at Bukiya replica weapon shop. Okabe bought it for 980 yen, but treats it as if it's a legendary blade.

Term 4: "Yep, Still a Dude'."
In regards to Ruka, talking about all his perfectly feminine qualities... but he's a guy.

Term 5: "Oh-ha~!"
Short for "Ohayou-gozaimasu' (Good morning). Part Time Warrior says this. The greeting won the grand prize in the buzzwords contest for 2000, a decade ago. It's significant for its horrible out-of-dateness.

Term 6: @channel
This is the fictional equivilant to a Chan such as 2ch, 2chan, and 4chan, with the first being implied. The only mentioned tripcode user is JOHN_TITOR. People that use a name but no tripcode include Hououin Kyouma and 'KuriGohan and Kamehameha'. In anime, JOHN_TITOR and Hououin Kyouma "age" the threads while KuriGohan "sages" them.<span style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Tahoma; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium;">

Term 7: JOHN_TITOR
According to the BBS, John Titor is a time traveler from the year 2036. The user posts on @Channel about a futuristic Dystopia in 2036.

Term 8: SERN
Short for Société Européenne pour la Recherche Nucléaire. A supposedly evil agency who works closely with particle manipulation, SERN is an anime counterpart to the real world CERN. In the series, SERN becomes the antagonist faction to Okarin and the lab. They are a major ruling force in John Titor's time.

Term 9: Dystopia
In reference to John Titor's time, a dystopia is a world that is put into a forced state of peace, but it's just a veiled dictatorship.

Term 10: Grandfather Paradox
The theory that if you were to go back in time to kill your biological grandfather, you would be from a parallel universe created by the death of your grandfather, as you would never have existed to begin with.

Term 11: World Line
Throughout time as a linear plane, World Lines are different variations of reality in which details differ from one world line to the next. There is a lot of hopping of World Lines, and as explained, the more times World Lines are traversed, the more varied the reality is.

Term 12: IBN 5100
An old computer developed by IBM, the IBN is the anime equivalent. It is a computer made in 1975 that runs very simple coding that is disregarded in future computer models, causing a very short stock to have ever been produced. This apparently is imperative to the use of a time machine, as said by John Titor.

Term 13: Mayushii Nyan-Nyan
Mayuri does a small position at a maid cafe as a catgirl maid, where they all say "nyan~" at the end of their sentences. It's quite cute.

Term 14: Forbidden Secret Technique
Faris' ancient technique called Through Shoulder. The reference to training at Guiana Hiland is a reference to G-gundam episode E18.

Term 1: HENTAI
In Japanese, means 'pervert'. Kurisu uses this quite often for Daru. He insists that he is not pervert, but perverted gentleman. Pervert gentleman is a @channel meme for harmless, mannerly pervert.no all hentai means is weird.

Term 2: Cristina (Kurisu-tina)
Another name given to Kurisu by Okarin. He teases her with this name because it is slightly awkward - it is a continent neutral name of American and Japanese origin. This is because she has been studing in America, and thought that it would be more suited for his 'international conspiracy' delusions. Other conspiracy-related women include Sara, Claudia and Simone.

Term 3: Labo-Mem (Laboratory Member)
The members of the "Future Gadget Lab", Okabe formally inducts each one personally.

Term 4: The Zombie
One of the many names given to Kurisu by Okarin. One could suggest that he enjoys teasing her. From Okarin's perspective, this name is fitting as she had been ressurected after being stabbed.

Term 5: Time Machine
T-i-m-e M-a-c-h-i-n-e

Term 6: Shining Finger
In reference to the Kung Fu skill from the protagonist of Gundam G series, this is the nickname given to Moeka Kiryu by Okarin because of her high-speed cell phone typing skill,

The voice actor of Daru had shouted "Shining Finger!" in Gundam G.

Term 7: Sambo
Name of a beef bowl (gyuudon) stand in Akihabara. Being known for Akihabara geek's favorite, it even has its own Japanese Wikipedia entry. No cellphone, no headphones and no questions are the rules of the shop.

Term 8: LHC (Large Hadron Collider)
This is a device used by both real world CERN and fictional SERN to collide atoms in attempt to create extreme forces of energy and such. It's the scientific way of "knocking things together until something interesting happens", including generation of a micro black hole. It runs underground in a ring. In Steins;Gate it's used to send people back through time.

Term 9: Canned Oden
In Japan, there are vending machines nearly everywhere for convinience. Not only does this include drinks, but quick-soup as well. Canned Oden is a local speciality of Akihabara.

Term 10: Rai-Net Sausage
Merchandise of the fictional anime series Rai-net Kakeru.

Term 11: "Human is dead, mismatch"
During Daru's investigation, a search on missing persons in SERN'S database shows articles involving particular test subjects being transported back in time and torn apart at the molecular level, each subject this happens to has their file branded with this phrase.

Term 1: Faris Nyan-Nyan
Pink haired girl, inheritant of Akiba city. She works in the same maid cafe as Mayuri and is a friend of Daru and Okarin. Daru looks up to her as the only 3D woman with a 2D soul.

Term 2: Rai-Net Dash (Rai-net Kakeru)
Fictional anime series. The story of 13 episodes is introduced in the original game Steins;Gate. The story revolves around an elementary-school hero Kakeru who fights online battles against evil hackers, with his girlfriend Kirari-chan and his legendary Monster-Program called Upa.

Term 3: Tennouji Nae
The docile only daughter of Tennouji Yuugo. She treats Mayuri as her older sister, and when the two meet, they often say "Tutturu" at the same time. She really loves her father and is frightened by Itaru and Rintarou.

Term 4: "I'm a full-fledged soldier"
"I'm a grown-up and a soldier" is the subber's mistranslation.

Term 5: Stardust Handshake
Something that Mayuri does sometimes, she looks to the sky and places her hand towards the sun. She's done this since her grandmother died.

Term 6: Feiris Cup
In the maid cafe, there is a tournament for Rai-net Access Battlers, a computer-themed boardgame in which the winner gets to request Feiris-chan do anything for them. RNAB is considered to be an arranged version of german boardgame Geister!.

Term 7: G-BACK
Okabe's strategy of winning his match Rai-net Access Battlers against Feyris. As their agreement was for Feyris to tell Okabe what she knew about the IBN-5100 if Okabe joined her in a match, G-Back, or 自爆 (pronounced jibaku, trans: suicide-bombing), ensures that their game ends quickly.

Term 2: That's why we love him.
An @channel meme taken from manga Jojo's Bizarre Adventures Vol.1. The full phrase is "That's just what you'd expect from Dio! He does something we never could! That's why we love him! That's why we adore him!!"

Term 4: Lab Coat
Token item of clothing for any scientist.

Term 5: Virus Card
A card piece used in the imaginary board game Rai-net Access Battlers. Player loses when he/she mistakingly captures four enemy Virus cards,

Term 6: Dk. Pepper
The drink of scientists and high-minded people alike. (obviously parody of Dr. Pepper as it is pronounced the same)

Term 7: Z-Program
The series of experiments SERN is performing at the LHC, using the particle accelerator to transport hopeful people back through time.

Term 8: Lifter
A triangular flight device that achieves lift by ionizing air molecules, forcing them through its central electromagnetic axis. It functions as a part of the phone-microwave/time-machine in the form of a 42" cathode ray tube (CRT) television, coincidentally placed beneath the floor of the FGL directly under the microwave.

Term 9: Jellyman's Report
The anonymous writer of the SERN time-travel reports involving "mismatched" individuals. Or perhaps named because these "mismatched" individuals listed in these reports have all turned to jelly (gel).

Term 10: Laegjarn's Chest
Also known as Pandora's Box.

Term 11: Singular Point
A point in time and space selected for existing. Once you pass the point, the function of time and space are switched each other. In other words, your time is stretched eternally and you can't escape from the point.

Term 1: Round-Table Meeting
A term meaning that members of a group will equally discuss a subject as peers to solve a problem or examine as situation - their table is rectangle, so it's funny. A reference to Arthurian Legend.

Term 2: Nostalgia Drive (Nostalgic Journey that Crosses Over Time)
NOSTALGIA DRIVU~ is a fancy term Okarin coined for the e-mails that they plan to send back in time. Because of his unusual naming sense, his suggestion was rejected by majority vote, and Kurisu's suggestion — D-Mail — ends up being chosen as the term to be used for subsequent experiments.

Term 3: The Mail that Leapt Through Time
This is Itaru Hashida's suggestion for a name that would describe the e-mails they send back in time. The phrase is in fact a reference to the movie "The Girl Who Leapt Through Time", a story of a girl who is able to travel back in time. It's sad.

Term 4: D-Mail
Kurisu's suggestion for the term to be used for the messages they send back in time. It is a shortcut of Mayuri's suggestion "DeLorean Mail" and it eventually becomes the "official" term the Future Gadget Lab would use to pertain to the messages. DeLorean is a reference to the Back to the Future movie series, wherein the car used by the main characters is a DeLorean DMC-12.

Term 5: Operation Urd (Norn of the Past)
Operation Urd pertains to the experiment which attempts to revitalize the project that involves sending messages back in time. Urd comes from the Norse Goddess of the same name who governs the past; she also has two sisters named Verthandi and Skuld. Of course, Okabe was the one who created the name.

Term 6: Kerr Black Hole
This is a black hole that spins; most black holes do not have an axis, as they 'suck in' all matter and space, practically folding in on themselves (not to be confused with collapsing). A Kerr Black Hole rotates on its axis as it pulls anything, but rather immediately into, can somewhat orbit matter around it infinitely. This is why it is associated with time travel, as supposedly the more you can approach the speed of light, the faster time becomes - if you were to somehow go faster than light, time could be transversed in either direction.

Term 7: Event Horizon
Basically, the "point of no return" around a black hole - nothing can escape the gravitional pull, not even light. This is the location in which nothing can affect anything outside.

Term 8: My Favorite Right Arm (Dependence on One's Right Arm)
In otherwords, something that cannot be replaced and is absolutely vital. A term to refer to an irreplaceable and useful ally.

Term 9: Super Hacka
Daru self proclaimed "Super Hacker" is called "Super Hacka" by Okarin.

Term 1: Phone Microwave Second Edition Version 1.03
The latest version of Okabe and Itaru's Phone Microwave (temporary name), with name invented by the latter. Unlike in the previous version, it can now send messages from any phone using the cellphone that comes with the Phone Microwave. However, it can no longer cook anything, even jelly bananas.

Term 2: Celebrity Seventeen
Kurisu is given yet another nickname by Okabe in this episode: Celeb 17 (or Celebrity 17). It pertains to Kurisu's well-to-do lifestyle (living in a hotel using her parents' money) that is unusual for someone of her age. Kurisu points out that she is eighteen, not seventeen, however.

Term 3: Sweets (lol)
[External Link]

Term 4: Oopa Cushion
One of the many items that can be found inside the Future Gadget Lab, the Oopa Cushion is recommended by Mayuri for people who feel down or is stressed. According to her, a quick squeeze of the soft plush doll from the Rai-Net Kakeru merchandise is enough to soothe one's mind.

Term 5: Tsundere
Roughly translates to "hot and cold". It is a term used to describe people (especially women) who act hostile or cold (tsun) and often later show their warm and loving side (dere) towards people of the opposite sex. Example: "It's not like I wanted to see you or anything."

Term 1: Reading Steiner
The ability of Okabe to retain all of his previous memories after a change in World Line. Activates after sending a D-mail, but only if the D-mail affects the past.

Term 3: Cute is Justice
Something Mayuri said to Ruka when he was (forcibly) wearing a cosplay that Mayuri made. It was said to calm him in a sense, but only made it worse.

Term 6: Pocket Pager
Urushibara Ruka (The guy, more feminine than any woman) wants to send a D-Mail to his mother, in order to change his gender, but at the time of his mother, mobile phones didn't exist yet, but there were pagers. Itaru converted the message to numbers and sent it to Ruka's mother using the "Phone Microwave (Name Subject to Change". The message was: "Eat vegetables for a healthy child" because Ruka believed that if a pregnant woman eats a lot of vegetables, she would have a girl, and if meat - a boy.

Term 7: EatVegitablesForAHealthyChild
Possibly a typograpical error for "Eat vegetables for a healthy child". This was the mail sent by Ruka Urushibara to her mother using Okarin's D-mail invention to change her gender (from being male to a female). However, due to it's limitations, as tested by Makise Kurisu, spaces between words have been omited to send the full message to Ruka's mother's pager (cellphones weren't so popular in the time of Ruka's mother's pregnancy).

Term 1: Cosplay
Cosplay is a type of performance art where participants wear costumes to represent a specific character.

Term 2: Physical Time Travel
Refers to the hypothetical theory of traveling time and space with the traveller's physical body. For example, Okarin, when he uses the Time Leap, he travels with his mind and send the informations in the Okarin on the other world line altering the later's memories. But when he uses the Physical Time travel (which is proven impossible in any terms) the Okarin from the original world line will vanished because his body, or to be exact, his very existence had already left that world line.

Term 5: Butterfly Effect
It means that one little thing can have huge consequences, using the butterfly as a example, it's said that the flap of a butterfly's wing can make a hurricane later.

Term 7: Rumiho Akiha
Rumiho Akiha (秋葉 留美穂) is Faris Nyannyan's real name.

Term 3: Actually a Guy
Refers to the fact that Ruka is a male, despite his female appearance.

Term 7: Moad Snake
Future Gadget #4. Kurisu recognizes the shape as a Claymore mine, but it is actually a "super-instant humidifier". Ruka accidentally sets it off, which covers the entire Future Gadget lab in a heavy fog.

Term 8: Once Again I've Connected Somthing Useless, by Goemon
Future Gadget #5, a powerful vacuum cleaner that acts as a dryer. Using this triggers the circuit breaker if any other appliances are also in use.

Term 9: Barrel Titor
John Titor's (Suzuha's) father, which is Daru. "Barrel" is literary translated as "TARU" in Japanese which was first noticed by Mayuri saying that "taru" sounds like "Daru" also describing his figure.

Term 1: 42" CRT
Refers to a large CRT-based television in Tennouji Yuugo's shop.

Term 4: Time Leap
A modification made to the "Phone Microwave (name subject to change)", allows Okarin to send his current memories to himself in the past, without changing world lines. This is highly used and specified in the series of deaths of Mayuri, where Okarin tries to prevent it by using the "time leap". He goes back, at least, three hours before the assigned time of Mayuri's death but his efforts always turned out to be futile.

Term 7: Comima
Short for comic market. A manga convention held twice a year at the tokyo big site building.

as the name suggest its a huge place with lots of manga booths. especialy doujinshis (fan made manga). A play on words with real-life equivalent Comiket.

Term 8: "Nullpo" > "Ga!"
See http://ja.wikipedia.org/wiki/%E3%81%AC%E3%82%8B%E3%81%BD

Term 10: You know too much.
A message by an unknown member of SERN which was sent to Okabe for developing the time leap machine.

Term 1: Time Leap Machine
A modification made to the "Phone Microwave (name subject to change)", allowing the user to send his current memories to himself in the past, it's not the same as the d-mail because Okabe stays in the same world line when he uses this.

Term 2: Heidegger
"Time is not a thing, thus nothing which is, and yet it remains constant in its passing away without being something temporal like the beings in time"

-Martin Heidegger

Term 2: My Fork
As a way for Makise Kurisu to understand that Okabe time-leaped back a few hours prior to Mayuri's death, she tells Okabe that she needs a "My Fork" to go with her "My Spoon" in the present, so that when he time-leaps back, she'll believe that Okabe came back from the future to save Mayuri.

Term 3: Rounder
Assassins that work separate from CERN and the Illuminati, but have the same goal as them. They are organized, but independent.

Term 4: Divergence
The point where two world lines or attractor fields separate into two different paths.

Term 5: Nixie Tube
Glass tubes with neon lights that display a number, usually time. They contain anodes and cathodes that change to match the time, or in this case, world lines. They are used in Okabe's Divergence Meter.

Term 6: Alpha Worldline, Beta Worldline
By using the first D-mail to undo the death of Makise Kurisu after she was seen stabbed and bathing in a pool of blood by Okarin, he created another world line different from his original world known as the Alpha world line. The Beta world line is Okarin's "original" world line and crossing the 1% divergence is the only way to get back there.

Term 1: Resistance
Refers to the anti-dystopia opposition group founded by Daru-kun and Okarin in 2036 in the Alpha world- line after escaping from SERN.

Term 2: KuriGohan and Kamehameha
The online alias of Makise Kurisu used on @Channel. Probably a reference to Dragon Ball's character Gohan and the famous attack Kamehameha.

Term 4: Pin Badge
Rintarou goes to give the pin badges with the initials of all the members of their group, he also keeps one for Suzuha Amane in the future.

Term 5: Bamboo-Copter Camera
It is Future Gadget #2,Alt. Edition Version 2.67 invented by Okabe and Daru. Unfortunately this gadget has a problem with spinning CCD camera.

Term 1: Suzu's Father
He is Barrel Titor, more commonly known as Itaru Hashida.

Term 2: FG204
Future Gadget No. 204 

Term 3: OSHM***A 2010
Okabe

Shina

Hashida

Makise


 * (Kiryu)


 * (Urushibara)


 * (Faris Nyan-Nyan)

Amane(Hashida Suzuha)

Term 4: Hashida Suzu
After Suzuha Amane travels back to 1975 in order to obtain an IBN 5100, she changes her name to Hashida Suzu. This is because Suzuha traveled back in the time machine that Daru tried to repair, but did not repair successfully, causing her to obtain amnesia as soon as she arrived in 1975. Hashida Suzu was the only thing she could remember, so she called herself that until she regained her memories in 2000.

Term 5: Yamanote Line
One of Tokyo's most important rapid transit circuits. The circuit consists of 29 stations around the city, among them the Ginza, Shibuya, Shinjuku and Ikebukuro stations.

Term 1: Attractor Field
'''The limiter between di 0% to >1% world. Okabe needs to pass through the barrier to the Beta world line (>1%) to prevents Mayuri's death. But in return Kurisu will dead in Beta world line.'''

Term 2: Rai-Net ABGC
Abbreviation for Rai-Net Access Battle grand championship

Term 5: Akiba Yukitaka
He is Faris Nyannyan's father.

Term 2: Suicide
This refers to the suicide of Kiryuu Moeka. She hangs herself in her apartment after not receiving any messages from FB despite her attempts to contact him for four days. Since Okabe needed her cell phone, he time leaps back a few days before her death in order to obtain it.

Term 3: New Cell-Phone
'''This is related to the D-mail that Kiryuu Moeka sent to her past self that tells her to get a new cellphone. She also sent another mail in quick succession to this one that said " The IBN5100 is in Yanabayashi Shrine. Recover it immediately." This message was the one that he need to undo to get closer to the beta world line. Okabe only succeeds in undoing this in the next episode when he sends the D-mail from FB's phone since he is the only person Moeka would have trusted.'''

Term 1: M4
'''The codename that FB gave to Kiryuu Moeka. Only FB knows of this codename.'''

Term 2: FB
Codename for the leader of the Akihabara Rounders. It stands for Ferdinand Braun and he is the owner of the apartment Okabe lives in.

Term 3: First D-mail
It was sent in the first episode by Okabe to Daru while his phone was connected to the phone microwave. The message was "Someone stabbed Makise Kurisu..." and thus parted from the beta world line into the alpha world line.

Term 4: Beta Worldline
'''The first worldine that Okabe was in when Steins;Gate first started. It is one where Makise Kurisu dies and WWIII will eventually start. The only way to prevent WWIII is to prevent her death.'''

The Divergence value is 1.130205.

Term 2: Dr. Nakabachi Conference
The conference at the Radio Building that Okabe and Mayuri attended in the beta timeline. Dr. Nakabachi (Kurisu's Father) claims to have found a way to time travel, but Okabe intervienes and accuses him of stealing John Titor's time travel thesis. This is also the conference where Makise Kurisu is killed by Dr. Nakabachi.

Term 3: Genbu, Suzaku, Seiryu, Byakko
The Chinese mythology legend where the North, South, East and West are governed by animals. These animals are "Gods" and they govern the four alchemy elements.

Genbu- The Black Tortise, governs the North, Winter and Water.

Suzaku- The Vermillion Phoenix, governs the South, Summer and Fire.

Seiryu- The Azure Dragon, governs the East, Wood and Spring.

Byakko- The White Tiger, governs the West, Metal and Autumn.

These guardians could also be a reference to the Shin Megami Tensei series.

Obake uses these terms as "Generals", as stated by Mayuri when she recalled the times she and Okabe had when it was just them in the Future Gadget Lab.

Term 4: Mayuri's Dream
Mayuri has those dreams, in which she always dies in all sorts of horrible ways, she remembers every time she died when Okarin was trying to save her from the inevitable death that awaited her in the alpha world line. Okabe attempted to rescue her through time leaping a few hours before her death although to no avail.

Term 1: Sewing Kit
A small set of tools that can be used for sewing. Kurisu's consists of black, red, & pink string, a needle (perhaps several), and possibly other items that are currently unknown. Kurisu uses this kit to stitch together a small rip in Okabe's White Lab Coat.

Term 2: 1% Barrier
'''Okabe needed the divergence meter to read a value greater than 1% because it would mean that he is back in the beta world line. In the alpha world line, it is <1% and Mayuri keeps on dying in those worlds no matter how hard Okabe tries to change them. '''

Term 4: Operation Verthandi ("Norn of the Present")
The Future lab's mission that will move from the Alpha attractor to the Beta attractor field by erasing all the previously sent D-mails

Term 1: The Third World War
The war fought in the Beta Timeline (sans Steins;Gate timeline) over Makise Kurisu's time travel thesis

Term 2: Steins Gate
The worldline that resides between the Alpha and Beta attractor fields. Because of this, it is exempt from events that occur in either field. It's Divergence value is -0.086109%. Since it is not affected by either attractor fields, Mayuri and Kurisu do not die.

Term 3: Serious Paradox
Amane Suzuha warns Obake that if he sees his past self, he'll cause a major time paradox. This could be related to tearing the fabrics of time and space.

Term 4: Doctor Nakabachi
'''He is Makise Kurisu's father and is possibly the one who stabbed her in the first episode. In previous episodes, it has been revealed by Kurisu that they have a horrible relationship due to her superior intelligence and his jealousy for her. He also stole the time machine paper that Kurisu wrote in the beginning, published it under his name only, and brought it to Russia where a race to create it began. '''

Term 5: Movie Mail
In the first episode, right after hiding from Kurisu, Okarin recieves a strange video message, which he can't view. In episode 23 he finds out that he can view the message after failing to rescue Makise Kurisu once. It turns out that the message was created by Okarin himself 15 years in the future.

Term 6: C204
In the Beta world line, Okabe creates this time machine in 2025. It has the ability to travel both forward and backward through time. Amane Suzuha arrives in Akihabara in 2010 in this time machine, with the goal of stopping World War III. Okabe names this machine after Kurisu (Christina); her death in the Beta world line and his desire to save her is the driving force behind his creation of the time machine.

This is also a reference to the "real world" John Titor, who claims that his time machine is called the C204.

Term 7: Operation Skuld ("The Goddess that Governs the Future" Operation)
The operation involves Okarin seeing Makise Kurisu lying in a pool of blood, to destroy the document about time machines, which Kurisu wrote and prevent World War III, Okarin has to trick himself in thinking that Kurisu is actually dead, he has to trick the World itself in order to save her.

Term 1: Cyalume Saber
It contains fake blood that Okabe will use to fool his past self into thinking it is the blood of Makise Kurisu.

Term 2: Oopa
OOPA is an acronym for Out-Of-Place-Artifact, but in this case, it refers to those spherical toys that look like bears. They are from the fictional Rai Net Access series. Okabe bought the Oopa that was the Metal Oopa from the beginning of the series. This is significant because the Metal Oopa was dropped in one of the Beta world lines and Makise Kurisu picked it up and put it in the envolope with her time travel thesis. The thesis was to be stolen by Dr. Nakabachi and taken to Russia, but in the other world lines, the Metal Oopa set off the metal detector, thus the paper was saved from an on-board fire. By buying the Metal Oopa, Okabe burned the thesis, thus ending the original cause of World War III.

Term 4: Lab Member No.008
Refers to Suzuha Amane who is going to be born 7 years after the story time line in 2017.