(Britain) Abbreviation for Baronetess, the feminine form of Baronet. It is a post-nominative title; the pre-nominative is Dame (e.g. Dame Jane Smith Btss). A more progressive form is for the holder of the honor to use Bt as a post-nominative (e.g. Dame Jane Smith Bt), as it does not refer to the recipient's gender (though the title "Dame" still does).

Initialism of British Tenpin Bowling Association.

(music) Abbreviation of bass tuba.

Abbreviation of Bhutan Time. / (Singapore English, transport, countable) Initialism of Basic Theory Test. A computerised knowledge test on the Singapore road rules held at a driving center.

Abbreviation of betacellulin.

Initialism of Back to the Future.

(petrochemistry) Initialism of (mixture of) benzene, toluene, and xylenes. / Abbreviation of botulinum toxin.

A black hole solution for (2+1)-dimensional gravity with a negative cosmological constant.

plural of BTZ black hole

(Singapore) A build-to-order apartment under a scheme of the Singapore government, built according to demand determined by the number of applicants and their down-payment.