Aviation is loaded with these acronyms. It's their technical jargon.

Communicating lots of information in minimal time seems to be really important to them for some reason...

Here's some good resources for looking up acronyms:

https://en.wikipedia.org/wiki/List_of_aviation,_avionics,_ae...

https://nbaa.org/aircraft-operations/airspace/tfm/glossary-o...

https://www.allacronyms.com/aviation/abbreviations

https://www.abbreviationfinder.org/