What does UBR stand for?

Ubir - Language code (ETLW)

Unassigned Bit Rate (SAUS)

Undefined Bit Rate (SAUS)

Unfocused Boss Rambling (SAUS)

Uniform Business Rate - Taxation - British

United Bison Resources - Vancouver Stock Exchange symbol

University Boat Race - Cambridge and Oxford - British (BARN)

University of British Columbia Retrospective Conversion - UTLAS symbol

Unspecified Bit Rate - Computer science (IGQR)

Upper Burma Rulings - India - A publication (DLA)