What does MISSINGNO stand for? 

missingno

MissingNo. (Japanese: けつばん, Hepburn: Ketsuban), short for "Missing Number", is an unofficial Pokémon species found in the 1996 video games Pokémon Red and Blue. The player can encounter MissingNo. through the use of glitches caused by the programming of specific in-game events. Encountering MissingNo. causes graphical anomalies within the game, and increases the number of items able to be stored in the player's inventory. Video game magazines and strategy guides covered the glitch, promoting the beneficial in-game effects, while Pokémon Red and Blue publisher Nintendo warned that encountering MissingNo. may corrupt the player's saved game. Retrospective analysis characterized the glitch as among the most famous in video games, and it was considered to help increase the popularity of the Pokémon video game series. Pokémon fans have attempted to incorporate MissingNo. into the franchise's canon as an intentional addition. The glitch has been studied for its impact on players and video game culture as a whole.

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