Is there a glossary of different terms and abbreviations used here anywhere?

I had a look but couldn't find one. I was thinking that for newcomers that lots of the terms used are confusing. This might make the forum seem cliquey (well, I guess it is!) but more to the point it might prevent them from posting.

Apologies if something exists and I've missed it. If not I'll happily start on something, perhaps turning this into a wiki thread.