What does UU stand for?

Micromicron (SAUS)

Reunion Air - ICAO designator (AD)

Reunion Air Service (SAUS)

Uglies Unlimited (EA)

Ulster Unionist - British (WDAA)

Ulster Unionist Party

Ultimate User - Nuclear energy

Unable (TVEL)

Unemployment Unit - An association - British

Unicorns Unanimous - An association (EA)

Union University - Tennessee

Universal Underclass (SAUS)

University of Utah, Salt Lake City, UT - Library symbol - Library of Congress (LCLS)

Unless Used (RIMS)

Urine Urobilin - Clinical chemistry (DAVI)

Urine Urobilinogen - Clinical chemistry

User Unit (MCD)

Utah University (SAUS)

Uudecode (SAUS)

Uuencode/Uudecode (SAUS)