TDP -> tardigrade-specific intrinsically disordered protein Most people would agree that this is an acronym - although some purists may prefer "initialism" as

TDP -> tardigrade-specific intrinsically disordered protein Most people would agree that this is an acronym - although some purists may prefer "initialism" as it's not pronounced as a word. At least, Merriam Webster seems to agree, and Oxford's lists that purist definition second to the way I used it.