Initialism of gin and tonic.

Alternative spelling of T-shirt

Initialism of science and technology. / (rail transport) Initialism of signalling and telecommunications.

A detail-oriented individual.

(aviation) A type of aircraft that has the horizontal stabilizer situated atop, or near the top of, the vertical stabilizer.

(statistics) Ellipsis of Student's t test.

Initialism of tongue and groove.

(statistics) Ellipsis of Student's t-test.

A rule with a short perpendicular crosspiece at one end, used by draughtsmen to draw parallel lines.

(immunology) A lymphocyte, from the thymus, that can recognise specific antigens and can activate or deactivate other immune cells.