Generally speaking, the term
alphanumeric refers to anything that consists of only
letters and numbers. For example, "ABC123" is an alphanumeric expression. The term may also refer to a device that handles such expressions (contrary to letters-only or numbers-only processing equipment). In
telecommunication and
computer science, an alphanumeric entity is specifically defined as a
character string that contains only letters and digits (and sometimes a few other characters, typically
punctuation marks).
See also:
ASCII
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