When you're new to a job everyone expects you to ask a million questions and not know what internal acronyms mean (although it would also be nice if they were documented). It'd be suspicious if a new employee didn't ask enough questions. It may be uncomfortable but you should never feel bad about it.
I personally start to struggle with this after the first year when the grace period to ask "stupid" questions is over.
I personally start to struggle with this after the first year when the grace period to ask "stupid" questions is over.