What does NGU stand for?

Geological Survey of Norway (SAUS)

Nachalnik Glavnoyo Upravlenia - Chief of Main Directorate - Soviet military rank

Nongonococcal Urethritis - Medicine

Norfolk, VA - Location identifier - FAA (FAAL)

Norges Geologiske Undersokelse - Geology for society (GIS)

Socal Custom Boats, Riverside, CA - Manufacturer code for watercraft hull identification number (USCG)

University of North Carolina, Greensboro, Greensboro, NC - OCLC symbol (OCLC)