A long list which seems to be kept up to date.
Over 337,000 acronyms, abbreviations and initials.
Search or browse acronyms and abbreviations by category.. (Copyright 2006 by Librarians' Internet Index)
For the classical scholar or the Latin enthusiast. Provides translations for Latin quotations, abbreviations, state and other mottoes, law and rhetoric, and religious and miscellaneous phrases. Also includes instructions for language and sentence structures, word building, etymology, and grammar.. (Copyright 2006 by Librarians' Internet Index)