What does DUI stand for?

Data Use Identifier (AFM)

Distinctive Unit Insignia - Military

Diving Unlimited International Inc. (SAUO)

Driving under the Influence (DHSM)

Drug Use Index - Psychology

Duisburg - Germany - Airport symbol (AD)

Dumun - Language code (ETLW)

Duraglass Boats, Willacoochee, GA - Manufacturer code for watercraft hull identification number (USCG)