For example, BASIC is apparently a "basic" programming language, and it stands for "Beginner's All-purpose Symbolic Instruction Code". The word acronym has even been made into a backronym - "Abbreviated Coded Rendition Of Name Yielding Meaning" (from BIBLIA (http://www.geocities.com/ben-fuzzybear/acronyms.html))
Examples:
These kind of acronyms are very common, see Canonical Abbreviation/Acronym List (http://www.astro.umd.edu/~marshall/abbrev.html)
[a portmanteau of back + acronym]. A hackish expression for a word interpreted as an acronym that was not originally so intended. This is a special case of what linguists call back-formation. Discovering backronyms is a common form of wordplay among hackers.
Compare to retronym
wikipedia.org dumped 2003-03-17 with terodump