Someone had posted a long list of abbreviations one time, but I don't know what became of it. Here are a few you might see around here:
people abbreviations / shorthand:
DH/DW /DD etc. dear husband, wife, daughter, son, niece, mom, etc.
SIL, DIL son in law, daughter-, mother-, father-, sister, bro. etc.
SO significant other
MTB mom to be
___ FH (fill in blank with whomever, like boss, MIL, neighbor, etc.) from H*** (let's just call it Hades ...
chicken abbreviations/shorthand:
RIR Rhode Island Red
BO buff orpington
BR barred rock
BBS blue black splash
PR plymouth rock, maybe partridge rock
WL white leghorn, BL brown leghorn, etc.
SLW silver laced Wyandotte
GLW gold laced Wyandotte
BLRW blue laced red Wyandotte
SF Salmon Faverolle et al ....
ACV Apple cider vinegar
BOSS black oil sunflower seed
DUW dial up warning (means lots of pictures or a BIG file)
IMHO in my humble opinion
There are SO MANY more but these are some that you'll come across regularly. Sometimes if you see one that's unfamiliar, you can figure out what it is by the context of the conversation and the replies posted. Hope this helped a little, and hope to see you around the forum!