Alphanumericals

Alphanumericals or alphanumeric characters are a combination of alphabetical and numerical characters. More specifically, they are the collection of Latin letters and Arabic digits. An alphanumeric code is an identifier made of alphanumeric characters.

A Black-headed gull ringed with an alphanumeric plastic ring that makes it easier to read from a distance.

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.


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