What does BUU stand for?

Basic User Unit (MCD)

Bass Tub - NCIC boat manufacturer code (NCIC)

Biununium - Chemical element (EPT)

Budu - Language code (ETLW)

Burdge Boatworks Inc., Stuart, FL - Manufacturer code for watercraft hull identification number (USCG)

Burlington, WI - Location identifier - FAA (FAAL)

BUSSU - NCIC firearms make code (NCIC)