Numbers in Japanese don't have a single pronunciation: both kun'yomi (native Japanese) and on'yomi (Chinese-derived) readings are commonly used. Japanese speakers take advantage of these different phonetic readings, mixing them freely to produce mnemonic phrases to remember long numbers, such as phone numbers or entrance exam [=IDs=]. This device, called ''goroawase'' (wordplay), also can be reversed to convert many Japanese names or phrases into code numbers.

''Goroawase'' numbers are read digit for digit, with each digit arbitrarily assigned a kun'yomi, on'yomi or GratuitousEnglish reading, often shortened to the first syllable or phonetically modified. Here is a list of digits and their possible readings:

||0 ||零|| ma(ru), o, re(i) ||
||1 ||一|| hi(to), i(chi), wan ||
||2 ||二|| fu, bu, pu, ni, tsu(u) ||
||3 ||三|| mi, sa(n), za ||
||4 ||四|| [[FourIsDeath shi]], yo(n) ||
||5 ||五|| [[OneTwoThreeFourGo go]], ko, itsu ||
||6 ||六|| mu, ro(ku) ||
||7 ||七|| na([[SevenIsNana na]]), shichi ||
||8 ||八|| ha(chi), ba, pa, ya, e(ito) ||
||9 ||九|| ku, kyu(u) ||
||10 ||十|| to(o), juu ||
||. (decimal point) ||点|| ten ||

Punning on the English meaning for 5/go has its own trope, OneTwoThreeFourGo. Also see SevenIsNana, FourIsDeath.
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!!Examples:

[[AC:{{Anime}} and {{Manga}}]]
* In ''Manga/SoulEater'', the number to call {{Shinigami}} is 42-42-564 (''shini-shini-koroshi'', "death-death-murder").
* In ''Manga/KeroroGunsou'', Keroro, Giroro and Natsumi are often associated with the numbers K66, 966 and 723.
* This trope is all over ''Manga/KatekyoHitmanReborn'' in the characters' names:
-->27: '''Tsuna'''yoshi Sawada\\
59: Hayato '''Goku'''dera\\
80: Takeshi '''Yama'''moto\\
69: '''Muku'''ro Rokudo\\
96: Chrome ('''Kuro'''mu) Do'''kuro'''\\
18: Kyoya '''Hiba'''ri\\
101: Irie Shou'''ichi'''\\
100: Byakuran ("B/Hyaku" = 100)
** This is also how they list their {{Shipping}}, so don't be surprised if a YaoiFangirl has a sort of random four digit (or sometimes five or six [[OT3 or more]] digit) number in their fanfic summaries.
* In ''Manga/{{Bleach}}'', Ichigo is 15 years old, was born on July 15, and has the number 15 on some of his shirts and his bedroom door.
* ''Manga/AhMyGoddess'': the protagonist sometimes signs his name as "K1" (Keiichi).
* ''Manga/AzumangaDaioh'': Yomi's student ID number when she goes to see if she passed the make-up entrance exam is 3661 - "''Sa-mu-ra-i'', huh?" The lurking fear is that if she didn't pass, she would be left without a university to attend (a ''{{ronin}}'', which originally meant a (samurai) warrior without a master but nowadays usually refers to those who have graduated high school but are not university students because they haven't passed entrance exams).
* ''Anime/YuGiOhZexal'' takes advantage of this with their Number monsters. For instance, No. 39 Kibo-oh Hope ("Utopia" in the dub) is the Yuma's trump card, and its number can be "sankyu" (the English "thank you") or "miku" ("future"). On the other hand, one recurring villain is No. 96 Black Mist ("Dark Mist" in the dub), with 96 being "kuro", or "black".
* ''Anime/TheGirlWhoLeaptThroughTime'': the weather will be nice (na-i-su) on July 13 (7-1-3)
* In ''Manga/KOn the Movie'', the song "Gohan wa Okazu" ("Rice as a Side Dish") is played in London during the Light Music Club's graduation trip, which is what they tell their fellow students when they get back. A girl says a word from the song ("Donaiyanen?"), and Ritsu says, "That's right, Ichigo!" This is quite appropriate, as the refrain of the song is basically [[OneTwoThreeFourGo counting from]] ''[[OneTwoThreeFourGo ichi]]'' [[OneTwoThreeFourGo to]] ''[[OneTwoThreeFourGo go]]'' and adding ''han'' to make the last number mean "rice".
* In the animal adventure episode of ''Anime/ExcelSaga'', the gambler of the group gets disturbed when he tosses his dice and they come up 4-2 ("shi ni", or "[[FourIsDeath to death]]"). [[spoiler:All the dogs, except for Menchi, are dead by the end of the episode.]]
* In ''LightNovel/HaiyoreNyarkoSan'', {{Doujin}} artist Tsuruko tries to psych herself up to talk to Mahiro ([[RuleThirtyFour about whom she wrote a]] BoysLove doujin) by practicing her introduction; in it, she mentions that her favorite number is 801 -- [[YaoiFangirl Ya-O-I]].
* In ''Anime/InazumaEleven'', Tsunami's surfboard has "273" written on it.
* In the letter columns run in ''OnePiece'', fans frequently suggest birthdays for characters both major and minor. Dates that [[AscendedFanon become ascended]] by Eiichiro Oda either fall into this trope or match up to holidays that suit the character in some way.
* In ''[[Manga/{{Rinne}} Kyoukai no Rinne]]'', Sakura needs to deduce the combination to Sabato's safe, but she has no clues because she doesn't know anything about him except his name. So she tries 3-8-10 (''sa-ba-to''). It works.
* ''Manga/DetectiveConan'': Kogoro likes to use his name in number format (556) as a password.

[[AC:FanWorks]]
* Some ''VideoGame/{{Touhou}}'' fanworks give Gensoukyou the (postal or telephone) area code 890. (Ha-ku-rei)
** [[http://danbooru.donmai.us/posts/934904 This comic]] (Possibly NSFW ads) shows off Cirno's math skills. To wit:
--->4 + 6 = Youmu\\
1 + 9 + 3 = Iku-san\\
0 + 6 = Reimu\\
3 + 9 + 8 = Sakuya
** Common examples are Patchouli's 69 (after her VerbalTic, ''mu-kyu''), Futo's 210, ("fu-to"), Koishi's 514 (often as the date 5/14) and Byakuren's 763 ("Namusan~").
* Strangely, this is used in the WesternAnimation/StevenUniverse fanfic Fanfic/SeedsOfRebellion for gem designation numbers
** Ruby and Sapphire's shared number is 8291 which can be read as ''hatsukoi'' (first love) if using the ''kokono'' reading of 9
** Pearl String 24976 = ''tsuyoku naro'' (let's become strong)

[[AC:LiveActionTV]]
* ''Series/KamenRiderFaiz'' has phone-based {{Transformation Trinket}}s and uses Goroawase as the activation codes for two Riders; Kaixa has 913 (ka-i-sa) and Psyga has 315 (sa-i-ga).
* Muck like ''Faiz'', ''Series/KamenRiderKiva'' has [[SecondRider Kamen Rider Ixa]], who activates his SuperMode by dialing 193 (''ikusa'') into his phone-gun.
** When he loses the IXA System, Keisuke Nago tries to become a BigBrotherMentor to its new user and starts wearing a T-shirt with 753 -- ''Nago-san'' -- on it. Since then, 753 has become a fandom short-hand for Nago's name. It even gets referenced in ''Film/KamenRiderXKamenRiderGaimAndWizardTheFatefulSengokuMovieBattle'', where the leader of the Kiva Army ([[TheCameo played by]] Nago's actor Keisuke Kato) wears a Main/MartialArtsHeadband with "753" on it.
* In ''Series/KamenRiderDecade'', in Kuuga's World Tsukasa discerns a pattern in the birthdates of the policewomen murdered by the Grongi, making the cops believe that the Grongi are trying to send a message. The message in this case being "Mi-na-go-ro-shi" or "kill everyone", with shi being the next cop being targeted. [[spoiler:As it turns out, Tsukasa was lying through his teeth; the "hidden message" was just a RedHerring to get the police out of the way guarding another cop while he used the ''real'' next victim as bait.]] Truly Tsukasa is quite the MagnificentBastard.
* ''Series/KyukyuSentaiGoGoV'' was a {{Rescue}}-themed ''Franchise/SuperSentai'' series that aired in 1999. "Kyukyu" means "rescue" but also sounds like "nine-nine", referring to the airing year; and "Go Go V" ("go go five") refers to Japan's emergency services number of 555.
* ''Series/JukenSentaiGekiranger'' has a character named Gou; his younger brother Retsu often calls him "Gou-niisan" ("my big brother Gou"). This sounds like "go-ni-san", i.e. 523, that 523 is sometimes used as shorthand for his name among fans.

[[AC:{{Music}}]]
* One Music/{{Vocaloid}} concert featuring Hatsune Miku was titled "39's Giving Day." "39's" can be read either as "Miku's" or a phonetic approximation of "Thank You" (''sankyuu'').
* Japanese band Go!Go! 7188 loves to play with numbers as their name suggest, one of his albums is named 569, which is read as "Goroku" (Go Rock)

[[AC:Web Comics]]
* In [[http://www.truefork.org/Art/comic/cindex.php?245 episode 245]] of ''NotQuiteDailyComic'' a pun is made on the Kanji for 1, 2 being read like "itchy knee".

[[AC:VideoGames]]
* 573 stands for Creator/{{Konami}}, and the number appears in many of their games; it appears on high score tables and background elements from time to time. The background elements in question are sometimes quite subtle or hidden references.
** There are 573 arrows on the Heavy chart for ''[[VideoGame/DanceDanceRevolution MAX 300]]''; something that wasn't immediately obvious because it was listed on the ''DDRMAX'' stats screen as 555 steps of which 18 are jumps.
** On really old ''VideoGame/{{Beatmania}}'' versions, there is a mix of the ''VideoGame/MetalGearSolid'' theme where you repeatedly trigger a bass drum sample - 5 times, then 7 times, then 3 times - on sixteenths, with well-spaced single hits in between.
** In many cell-phone games that feature the KonamiCode, "B and A" at the end is often replaced by 573.
** ''VideoGame/CastlevaniaBloodlines'' has a musical EasterEgg enabled by going into option mode and setting the BGM to 05 and the sound effects to 073.
** ''[[VideoGame/CastlevaniaChroniclesOfSorrow Castlevania: Dawn of Sorrow]]'' has three areas where you need a certain three digits at the end of your money amount to open doors. One of them is, yes, 573.
** In ''[[VideoGame/MitsumeteKnight Mitsumete Knight R: Daibouken Hen]]'', the icon sprite of one of the game's [[VirtualPaperDoll numerous pieces of equipement]], the "[[SuspiciouslySpecificDenial No-Brand Pendant]]", depicts a necklace with the number "573" written on it.
** In ''VideoGame/{{Beatmania}} IIDX'', you need to finish a song with at least 80% on your gauge to clear it. Finish with ''exactly'' 80% and you get a bonus of 5730 points.
*** Then Tricoro goes ahead and makes unlock conditions for a series of boss songs all revolve around 573 too.
** Some ''Franchise/YuGiOh'' games have an achievement for winning a match with 5730 Life Points remaining. As you can guess, it's nearly impossible to pull off in normal gameplay.
*** In [[VideoGame/YuGiOhTheFalseboundKingdom one particular Yugioh game]], using the code increases your money by 573 instead.
** In ''VideoGame/TwinBee Yahoo!'', powerup bells collected by players already at full power are worth 57300 points each.
** Even the [[http://www.konami-digital-entertainment.com/contact.php phone numbers]] for Konami's offices frequently end in 573.
*** Especially Konami's Japanese offices, who's number is nothing but 5's, 7's, 3's and 0's.
** Para-Medic's frequency number in ''VideoGame/MetalGearSolid3'' and ''VideoGame/MetalGearSolidPortableOps'' is 145.73 (''ishi konami'', or "Dr. Konami").
** The default top score in the arcade version of ''VideoGame/{{Gradius}}'' is 57,300 points.
** In ''VideoGame/MetalGearRisingRevengeance'', the license plate on Raiden's car is 573-PTG, a reference to both, Konami and Creator/PlatinumGames.
** Konami's official Website/YouTube channel is [=KONAMI573ch=].
** In ''VideoGame/HardCorpsUprising'', the mid-boss and end-boss in Mission 3 are mechs codenamed the 573 Tigris and the 573 Draconis respectively (they are called Kasuga-Tora and Kasuga-Ryu in the original Japanese versions). Additionally, the 30-lives upgrade costs 57,300,000 Corps Points, and the maximum number of credits the player can attain after accumulating more than 16 hours of playtime is 573.
** ''VideoGame/{{Otomedius}} G'' has a set of achievements for playing the game for 5 minutes, 57 minutes and 573 minutes, and another set of achievements for touching the angels 5 times, 57 times and 573 times.
** The "Snake Escape" minigame in ''[[VideoGame/ApeEscape Ape Escape 3]]'' is unlocked by purchasing it from the Hobby Shop with 573 coins.
** The song "Nengo Rock/Suwa Hideo no gorogoro nengo oboe uta ketteiban" from ''[[VideoGame/PopNMusic Pop n' Music]]'' is full of Goroawase Numbers, including a "573" at the end.
** In ''[[VideoGame/PopNMusic pop n' music]]'', one of the [[InterfaceScrew "ojama"]] modifiers will cause a variety of random numbers to show up for the combo counter... including, of course, 573.
** In ''Lightning Fighters'', the star bonus items max out at 5730 points each.
* 765 stands for Creator/{{Namco|Bandai}} (''namuko''), and the number likewise appears in many of their games.
** Xiaomu from ''VideoGame/NamcoXCapcom'' is 765 years old.
** The ''Namco Museum Vol. 3'' version of ''VideoGame/TheTowerOfDruaga'' includes the secret "Another Tower," where the trick to revealing the treasure chest on one of the floors is letting the timer reach 7650.
** ''VideoGame/TheIdolmaster'' revolves around fictional talent agency 765 Production, whose rival company 961 Production is headed by a man named Kuroi. This crosses over with the tie-in DLC for ''VideoGame/AceCombat6FiresOfLiberation'', where the Idolmaster-themed DLC planes were given ammo counts referencing their respective character's height and three sizes - the themed A-10, representing the full cast at once, was instead given 765 standard missiles and 70 rockets, 60 fuel-air explosive bombs, or 50 air-to-ground missiles.
** A maximum of 7650 points can be scored at once in ''Pac-Land'', ''Pac-Mania'', ''Märchen Maze'' and ''Marvel Land''.
** In ''VideoGame/{{Tekken}} Tag Tournament 2'', you can get a trophy by tagging out with your partner 765 times. Gold Boxes may contain 765,000 gold instead of an item, and Lucky Boxes can contain up to 765,000 gold.
** In ''Tekken 6'', the Special Flags in Scenario Campaign mode are worth 7650 points each.
** In ''VideoGame/TalesOfTheAbyss'', the world of Auldrant has a 765-day year.
** ''VideoGame/TalesOfVesperia'' and ''VideoGame/TalesOfLegendia'' have the 765kg Hammer.
** ''VideoGame/NobyNobyBoy'' has a trophy for reporting a length of exactly 765m.
** Most cover cars in the ''VideoGame/RidgeRacer'' series sport the number 765. There's also a fictional sponsor in the game, obviously called ''765'', which apparently is a fuel company. Oh, and then there's the racetrack "Seaside Route 765".
** One trophy in VideoGame/TaikoNoTatsujin V Version requires you to get 76500 total drum hits throughout the game.
** One of the recurring "Lucky Numbers" (a rank at which you can receive one of the top-tier rewards without being in that tier) in ''VideoGame/AceCombatInfinity''[='=]s ranking events is 765.
* ''Franchise/{{BEMANI}}''
** ''VideoGame/{{beatmania}} IIDX'' has a song titled ".59", read as ''tengoku'' (heaven).
*** About 8 years later we have "G59", read as ''jigoku'' (hell), by the same composer.
** In some versions of ''IIDX'' that have high score tables, one of the default score names is "4CTAKA", meant to be read as "Yoshitaka", as in DJ YOSHITAKA.
* ''[[VisualNovel/FourTwoEightFuusasaretaShibuyaDe 428]]'', a VisualNovel set in the city of Shibuya.
* ''VideoGame/AtlantisNoNazo'' has "Key Word ~Nagoya~" appearing over a pyramid in the 20th Zone, to the right of three Moai statues. "Nagoya" is supposed to be a clue to stand on each of the three heads in turn and throw bombs seven, five and eight times, respectively.
* 2424, ''VideoGame/PuyoPuyo''. Is occasionally an ArcNumber in the [[ExcusePlot minimal]] storylines, and often extended one digit to 24242 to be the default high score value in the games that keep track of that.
** Additionally, some of the games have punny titles for the sequel: Puyo Puyo Tsu (two) for the second, Puyo Puyo Sun (san) for the third, and Puyo Puyo~n (yon) for the fourth.
* In ''Franchise/TokimekiMemorial Girl's Side'', Himuro Reiichi is nicknamed "01" by some of his students. In ''TMGS 2'', his cousin Hikami takes the joke a step further by addressing a gift to "0123" ("Reiichi-[[JapaneseSiblingTerminology niisan]]").
* In ''VisualNovel/{{Deardrops}}'', the numbers in "Live Space 696" can be pronounced ''ro-ku-ro'' ([=Rock'n'Roll=]).
* Defeating the BonusBoss in the first ''VideoGame/{{Yakuza}}'' game earned you a million yen and 893 experience. As noted below, this is because you can say 893 as "Ya-ku-za".
* In an alphanumeric example, when the XboxOne was revealed [[http://www.edge-online.com/features/something-about-japan-why-xbox-one-could-be-microsofts-final-strike/ one of the nicknames that popped up in Japan for it]] took its "X1" abbreviation and made it "batsu-ichi" - meaning "divorcee" with a subtext of failure.
* In ''VideoGame/GitarooMan'', the main character U-1 is named Yuichi.
* Inverted with Miyo in ''VisualNovel/HigurashiWhenTheyCry''; she changed the kanji of her given name to 34 to show her dedication to following the work of her adopted father, Hifumi (123). It's implied that if she kept her full given name, Miyoko (345), she might have gotten further.
** The creator, Ryukishi07, can be prounounced Ryukishi Reina or Rena; another Higurashi character.
* One of the racetracks in ''VideoGame/{{Wipeout}} 3'' is called "Hi-Fumi" (123).
* In ''VideoGame/{{Persona 4}}'', Yukiko's Persona is Konohana Sakuya. "Sakuya" can also be read as 398, and her Instant KO in ''VideoGame/Persona4Arena'' appropriately deals 398 hits.
* ''VisualNovel/NineHoursNinePersonsNineDoors'' has this as a plot point: [[spoiler: The protagonists believe they are looking for a door marked with a number 9 (kyu), when in fact they're looking for a door with a Q (''kyu'') on it. In English, the wordplay is removed, and instead hinges entirely on the fact that a lowercase q kind of looks like a 9 if written a certain way.]]
* In ''VideoGame/FinalFantasyIX'', you can randomly [[FairyBattle run into]] a weird creature called Ragtime Mouse that asks you PopQuiz questions. Once you answer all of them, the next time you run into him, he tells you the percentage of correct answers and if you got all of them right, he gives you 23852 Experience divided amongst the 4 party members, totalling 5963 Experience each as well as 59630 Gil: 5963 can be read as "gokurosan", which stands for "good job".
* In the Creator/{{Toaplan}} ShootEmUp ''Batsugun'', one BossBattle has a series of tanks which come out in two files, and bombing them all at once will score 59630 (''gorokusan'') points each.

[[AC:RealLife]]
* {{Suda51}}, the name adopted by the video game creator Goichi Suda.
* 524 Records, a label established by Yasuharu Konishi.
* 893 is often used to refer to the {{Yakuza}}, such as protection money being paid to "Customer #893."
* "888..." is read as "pachipachipachi..."[[note]]note that it's written ''pachi'' and not ''hachi''; this involves a phenomenon called ''[[https://en.wikipedia.org/wiki/Rendaku rendaku]]''[[/note]], an onomotopeia for clapping. You can sometimes see long streams of 8's in NicoNicoDouga video scrolling comments.
* The [[Franchise/{{Pokemon}} PokéPark]] ThemePark in Nagoya, Japan was located on Route 758.
* Many gaijin interested in Japanese media use 39 or 3Q to mean "thank you", as "san kyu".
* Race cars backed or entered by Nissan often carry the number 23.
* Also, 3923 can also mean "Thank you Nissan!" in which can be translated as "Thank you, big brother!"[[note]]"Nissan" sounds similar to "big brother" in Japanese. Found in the Online Comics of NBC TV Show Heroes, for which Nissan is a sponsor[[/note]].
* This also crops up in Chinese every now and then. One such example is saying goodbye on text messages with "88", since the number 8 in Mandarin is "bā", so two 8's spoken together is "bābā" which sounds like the English "bye-bye."
* February 22nd has begun to unofficially be celebrated as "{{Ninja}} Day", because the date of 2/22 can be read as "nin/ninnin".
* Music/{{BEMANI}} composer Yuichi Asami goes by the handle U1-ASAMi.
* Some Japanese restaurants have special offers on meat dishes on the 29th day of the month, since that is "Niku (Meat) Day".
* Creator/MinakoKotobuki uses 375 as her number, most commonly on her radio show where it is included in the official e-mail address.
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