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Alphanumericals oralphanumeric characters are any collection of number characters and letters in a certainlanguage. Sometimes such characters may be mistaken one for the other.
Merriam-Webster suggests that the term "alphanumeric" may often additionally refer to other symbols, such as punctuation and mathematical symbols.[1]
In the POSIX/C[2]locale, there are either 36 (A–Z and 0–9, case insensitive) or 62 (A–Z, a–z and 0–9,case-sensitive) alphanumeric characters.
When a string of mixed alphabets and numerals is presented for human interpretation, ambiguities arise. The most obvious is the similarity of the lettersI,O andQ to the numbers1 and0.[3] Therefore, depending on theapplication, varioussubsets of the alphanumeric were adopted to avoid misinterpretation by humans.
In passenger aircraft,aircraft seat maps and seats were designated by row number followed by column letter. For wide bodied jets, the seats can be 10 across, labeledABC-DEFG-HJK. The letterI is skipped to avoid mistaking it as row number1. Invehicle identification numbers used by motor vehicle manufacturers, the lettersI,O andQ are omitted for their similarity to1 or0.
Tiny embossed letters are used to label pins on an V.35/M34 electrical connector. The lettersI,O,Q,S, andZ were dropped to ease eye strain with1,0,5,3, and2. That subset is named theDEC Alphabet after the company that first used it.
For alphanumerics that are frequently handwritten, in addition toI andO,V is avoided because it looks likeU in cursive, andZ for its similarity to2.
