Tuberculosis, a chronic infectious disease

Taco Bell (TB), a Mexican-style quick service restaurant chain where most go after drinking, from a late night party, or up late at night and want to eat.

Terabyte (TB), a unit of information used, for example, to quantify computer memory or storage capacity

Total bases (TB), a baseball statistic.

Terabit (Tb), a unit of information used, for example, to quantify computer memory or storage capacity

Terbium (chemical symbol Tb), a chemical element

Tampa Bay (TB), a region in Florida.

Tailback (TB), a position in American football.

Teen Baby (TB), a teen that wishes to be a baby; also infantalism