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The Zero/One resembles a heavily pixelated version of the basic Kingdom Key. Its guard is yellow with some lime green sections on it, while its blade is silver at its tip and darkens toward its base. The Keychain has a silver hidden Mickey token connected to the Keyblade by three links. The shaft of the blade, the handle, and the links of the Keychain all sport thin, red patterns on them.
Its name is based on the numbers "0" and "1", which make up the binary system, the basis of computer programming.
The Zero/One is featured on the cover art of Kingdom Hearts HD 2.5 ReMIX in order to represent Kingdom Hearts Re:coded. However, it does not appear within the game proper, as its exclusively-cutscene version of Re:coded only depicts Data-Sora with the Kingdom Key.