A decimal digit or a letter (upper or lower case). Typically, "letters" means only English letters (ASCII A-Z plus a-z) but it may also include non-English letters in the Roman alphabet, e.g., e-acute, c-cedilla, the thorn letter, and so on. Perversely, it may also include the underscore character in some contexts.

Last updated: 1997-09-11

Nearby terms:

Alpha EV6Alpha Geekalphanumericalpha particleAlphardalpha testing

Try this search on Wikipedia, Wiktionary, Google, OneLook.