This thread discusses many of the acronyms http://www.cassiopaea.org/forum/index.php?topic=1599&p=1
If there are more that are confusing you, just ask - it can be quite distracting and confusing at first , but don't give up. ;)
(not that I am a proponent of the use of acronyms, I find them distracting myself, but they seem to be everywhere these days)