I think abbreviations leave a lot to interpretation.
It can mean what the reader wants it to mean at the moment.
Some of them tickle me. OBW is the hardest one for me to remember. I am just beginning to know it is one block wonder before I have to look it up. Some of them I just ignore.
Question: Is there a reason we don't use our family names instead of DH (husband) DD (daughter) DS (son) and so on? Is there jeopardy in using their first name?