The twentieth letter of the English alphabet, called tee and written in the Latin script.

The ordinal number twentieth, derived from this letter of the English alphabet, called tee and written in the Latin script.

Teen.
Taxable.
American Library Association abbreviation of twentieth, a book size range (12.5-15 cm in height).
Transgender (TG) or transsexual (TS) (sometimes used in contrast to cisgender M or F; compare NB).

(informal) A T-shirt.
Abbreviation of Tuesday.
Abbreviation of Thursday.
Tenor.
The Ford Motor Company's Model T automobile.
Trailer car.
(informal) The Massachusetts Bay Transportation Authority, or MBTA; specifically, the subway or train.
Abbreviation of ties (statistic).
A technical foul.
Abbreviation of testosterone.
A T wave.
A T cell.
A T-beam.
Abbreviation of temperance; marked in the ship's books when a sailor chose money instead of the daily rum ration.

AT&T.
(informal) The roughly T-shaped rural part of Pennsylvania, located between Philadelphia and Pittsburgh.

the prefix trans-.