I just learned what they mean.
DH- dear husband
DD- dear daughter
DS- dear son
DW- dear wife
I am not sure if there are any more of these and please correct me if i am wrong!
over some that I see, but most of the time I can figure them out due to the context of the sentence they're in. Here is a list of some common acronyms you'll see on message boards. http://www.eyeonsoaps.com/GH/acronyms.htm