(astronomy) Initialism of trans-Neptunian object.

Abbreviation of trinitroglycerin.

(historical) Initialism of Territory of New Guinea.

Initialism of Trans–New Guinea.

(BDSM) Of or pertaining to younger BDSM practitioners, typically under the age of approximately 35 years, especially as a collective.

(BDSM) A social club for younger BDSM practitioners, typically for those under the age of approximately 35 years.

(television) Initialism of Star Trek: The Next Generation.

(historical) Initialism of Transitional National Government of Somalia.

Initialism of trap–neuter–return: a program designed to neuter and release feral cats (and, more rarely, dogs).

plural of TNO