I haven't seen a list, because they are not extablished by Administration, but by users.
A lot of letter combos are family references: DH = dear husband, SIL = son-in-law or sister-in-law (I don't know how to tell which), etc.
FQ = fat quarter, WOF = width of fabric, LOF = Lengthwise of fabric
Depending on your computer, you may see smilies as faces or as letter and character combinations. :-) is either :,-,) or a smiling yellow face.
Anytime you don't recognize an abreviation, it is fine to ask!