Trademark symbol (™)

Turing Machine

Transcendental meditation

Translation memory

Transactional memory

Tank Mania, an online multi-player flash game

TrackMania, a PC Racing Game

Tokyo Marui, a Japanese Airsoft gun manufacturer

Transition metal

Text mining

Transverse Magnetic modes, in optics and wave theory

Tympanic Membrane

Telekom Malaysia (the largest telecommunication company in Malaysia)

.tm, the Internet domain code for Turkmenistan.

LAM - Linhas Aéreas de Moçambique (the national airline for Mozambique), "TM" is its IATA airline designator

melting temperature in shorthand

struct tm, an aggregate datatype in C and C++ for representing calendar dates

Technical Machine, an item for teaching moves to Pokémon

Texas Mexican Railway (AAR reporting marks TM)

Thematic Mapper, Earth observing sensor aboard Landsat 5 in the Landsat program.

Thulium, a lanthanide element with 69 protons in its nucleus

Timiş county (Romania) indicative (TM)

TM Supermarket, a supermarket chain in Zimbabwe

TM Television, a television channel in Mongolia

T-money, Korea's first smart card. (Tm)

Tony MacAlpine, an American virtuoso guitarist and keyboard player

Toyota Motor Corporation, which trades on the New York Stock Exchange with symbol "TM".

TransMilenio - TM, a Colombian bus rapid transit system.

Transverse Mercator, a type of map projection