I always get confused when using common Latin phrases and abbreviations, and in the interest of not appearing to be an idiot, I make an attempt at looking them up in order to use them correctly.  Here are a few from AccessAbility SIG of the Society for Technical Communication

i.e. - id est - that is
e.g. - exempli gratia - for example; for instance
etc. - et cetera - and so on; and other people/things #language