In computers designed for English language users,
alphanumeric (sometimes seen as alphameric) characters are those comprised
by the combined set of the 26 alphabetic characters, A to Z, and the 10
Arabic numerals, 0 to 9. In some usages, the alphanumeric character set
may include both upper and lower case letters, punctuation marks, and
symbols (such as @, &, and *, for example). For languages other than
English, alphanumeric characters include letter variations such as é
and ç. For some computer usages, such as file naming, alphanumeric
characters are strictly limited to the 26 alphabetic characters and 10
numerals; however, for other usages, such as programming, other keyboard
symbols are sometimes permitted.
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