I don't know which industry has the fewest, but test preparation might have the most. When I worked for Kaplan Test Prep, we even had acronyms for acronyms! So

I don't know which industry has the fewest, but test preparation might have the most. When I worked for Kaplan Test Prep, we even had acronyms for acronyms! So most tests are acronyms (GRE, GMAT, LSAT, MCAT, DAT, etc.) but we even had an acronym to describe the graduate level tests (GGLMD).