br

(noun) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water. Synonyms: bromine, Br, atomic number 35.

(noun) 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. Synonyms: Red Brigades, Brigate Rosse, BR.