biglouis
There are common abbreviations that we all use to save time. Some of us have arthritic hands. You will get the odd troll complaining that someone used an abbreviation like NDN rather than typing out "next door neighbour" every time but they just make themselves look foolish.
In my opinion, no-one makes themselves look foolish by objecting to people using home-made abbreviations.
After all, if you are using a laptop you can make a macro to type in full any phrase you use so often that it is hard to write in out in full all the time.
Abbrieviations are fine, if they are well know. Nobody would consider writing The British Broadcasting Coporation instead of the BBC would they?
On the other hand SIL on this site can either mean sister-in-law or son-in-law and it is not always clear whom you meant.
I have never addressed, and probably never will, my husband as "dear husband" and I feel slightly ridiculous subscribing to the convention that DH on Gransnet signifies the man one is married to - especially if I am giving vent to my exasperation with the dear man!