What does HAU stand for?

Haudompre - France - Seismograph station code, US Geological Survey (SEIS)

Haugesund - Norway - Airport symbol (OAG)

Haultain Resources Ltd. - Vancouver Stock Exchange symbol

Haupert Auto & Boat, Ottumwa, IA - Manufacturer code for watercraft hull identification number (USCG)

Haut Rhin - NCIC firearms make code (NCIC)

Hebrew Actors Union (EA)

Helena, MT - Location identifier - FAA (FAAL)

Hemagglutination Unit - Hematology

Holstein Association USA (EA)

Horizontal Arithmetic Unit

Hybrid Arithmetic Unit

San Francisco Chontla Huasteco - Language code (ETLW)

Hausa - MARC language code - Library of Congress (LCCP)