Alphanumeric refers to a combination of letters and numbers in a given language set
. In English, alphanumeric characters include the 26 alphabetic characters (A to Z) and the 10 Arabic numerals (0 to 9)
. However, for some computer purposes, such as file naming, alphanumeric characters are strictly limited to the 26 alphabetic characters and 10 numerals
. Other keyboard symbols may be permitted for programming purposes
. In some usages, the alphanumeric character set may include both upper- and lower-case letters, punctuation marks, and symbols such as @, &, and *
. For languages other than English, alphanumeric characters include letter variations with accents, such as é and ç
