WordNet (r) 3.0 (2006):

Br
    n 1: a nonmetallic heavy volatile corrosive dark brown liquid
         element belonging to the halogens; found in sea water [syn:
         bromine, Br, atomic number 35]
    2: a Marxist-Leninist terrorist organization that arose out of a
       student protest movement in the late 1960s; wants to separate
       Italy from NATO and advocates violence in the service of
       class warfare and revolution; mostly inactive since 1989
       [syn: Red Brigades, Brigate Rosse, BR]

The Free On-line Dictionary of Computing (19 January 2023):

br

    The country code for Brazil.

   (1999-01-27)