I liked one Pip came up with the other day when talking medical things with a nurse. Not really sure what they mean but a PID could be pelvic inflammatory disease or prolapse intervertabral disc. Guess abbrevs can be confusing.

She also tells me of a ward round when someone to the consultant said what he needs is an RTS (which to me in a former lift, I might have thought Return To Supplier). The consultant was unsure what an RTS was but was told it is a raised toilet seat.