Making everything into a Three Letter Acronym has led to many TLAs having multiple meanings.
If you kiss your Palm Pilot on the street, is that a PDA PDA?
If you use an Asynchronous Transfer Mode backbone to download Adobe Type Manager fonts to a cash machine, are you sending ATM over ATM to an ATM?
What are some other examples?
EDIT: is a piece-of-shit point of sale terminal at the Port of Seattle a POS POS POS?