Some other good ones to know are ISO and TNT. ISO stands for "In Search Of". Lets say you wanted to find a recipe for Chicken Parm, you could post a message and the title would be ISO: Chicken Parm. That way people would know that the post was not a recipe, but a request.
TNT stands for Tried and True. If you for a recipe (REC) and it is one you have made before and enjoyed then you could use TNT, for instance REC: Chicken Parm TNT. This way people know they won't go wrong with the directions because someone else has already made this and it worked well