(fishing) Initialism of giant trevally. / (fishing) Initialism of golden trevally. / (motorsports) Initialism of grand tourer. / (endocrinology) Initialism of gain of thyroid.

(music, Japan) Abbreviation of guitar (of a rock band)

Initialism of Global Telecommunications System, a worldwide network for the transmission of meteorological data from weather stations, satellites and numerical weather prediction centres.

Abbreviation of geologic timescale. / (Internet slang) Abbreviation of giantess (as a paraphilia).

(medicine, dated) drop (as a measurement in medical prescriptions)

plural of GT

(endocrinology) The secretory capacity of the thyroid (if calculated with the structure parameter inference approach).

Initialism of Greater Toronto Area, the most populous urban region in Southern Ontario, Canada.

(video games) Any game in the Grand Theft Auto series. / Initialism of graduate teaching associate.

Guantanamo Bay, the US naval base in the place of that name in Cuba.