- (baseball) Second base, second baseman.
- (baseball) Double, a baseball statistic indicating a runner has safely advanced to second base.
- (Britain) A grade of pencil with lead that makes darker marks than a pencil grade B but lighter marks than a pencil of grade 3B.
|For pronunciation and definitions of 2B – see 二屄 (“idiot; dottard; fucking idiot”).
(This term, 2B, is a variant form of 二屄.)