Moderating note: I've removed the second TLA in the original title. Thankfully, this was a TLA rather than the actual words, but best to keep things clean in a family-friendly forum
Out of curiosity, what are some of the TLA's that have confounded you?
It's not just these forums, but internet forums and electronic communications in general where some elements of abbreviation have become common. @GUB has mentioned some well-known photography-related acronyms that are not only frequently seen here, but are in common-place use between photographers these days. And it varies by manufacturer... You'll see the term "IS" used on Canon forums instead of "SR", but you'll find some folks use them interchangeably.
We've never encouraged the use of acronyms or cryptic terminology here. It's just an evolution of photographer speak. I do think we sometimes assume everyone knows what we're talking about, but then for those that don't, it's part of the learning process. Earning their stripes, if you will