@melindamarks The acronyms that annoy me most are the ones that are undefined in whatever document I happen to be reading.
There are so many acronyms in English that every 3 letter combination I have ever looked up has multiple meanings, sometimes even within a single industry. And when I start editing within a work environment, I invariably find undefined acronyms dotting the documentation landscape in a minefield of tacit agreement, which is all well and good until new people step through the door and need to learn the new language of your organisation.
It’s simple - where you don’t need to use an acronym, don’t. If you absolutely must use an acronym, don’t make a new one where an old one works. And in all instances, make certain it’s defined, both on first use (per document) and in an easily accessed glossary.