Too many TLAs?
But where do you start? Anyone in the flying business may recognise OAT, IAS, VOR, etcetera (avoiding "etc!"), but equally in military circles, VOR means something else, and then you have all the common military (mil) ones like Tpt, ORBAT, SAR, RAS, BLR.
Then there are the country specific ones. CONUS, HMG, POTUS, HMTQ, VAT, GST.
Not forgetting the common "life" ones like ASAP, SNAFU, PDQ.
Do all these need defining too?
That's a GBFO job for someone!