TM
- Tm
- (s) Terametre
- Thulium
- TM
- (i) Technical Manual
- Theatre Missile
- Thematic Mapper
- (p) trademark (often written in small superscript type: TM or ™)
- (i) Turing machine
- (s) Turkmenistan (ISO 3166 digram) Tympanic Membrane
- TMA
- (i) Terminal Manoeuvring Area (restricted flying zone)
- Texas Medical Association
- Tristeza y muerte de agave (Spanish, "wilting and death of agave") – a disease affecting the blue agave, from which the popular spirit tequila is produced
- TMAP – (a/i) Texas Medication Algorithm Project
- TMC – (i) The Movie Channel
- TMD – (i) Theatre Missile Defence
- TMI – (i) Too Much Information
- TMJ – (i) TemporoMandibular Joint (syndrome)
- TMM – (s) Turkmen manat (ISO 4217 currency code)
- TMNT – (i) Teenage Mutant Ninja Turtles
- TMO
- (i) Table Mountain Observatory
- Television match official (rugby union)
- TMP
- (s) East Timor (ISO 3166 trigram; obsolete 2002)
- (p) Temporary
- TMPG – (i) Transparent Multi-Platform Gateway
- TMR – (i) Twin Main Rotors (helicopter type)
- TMS – (i) Transcranial Magnetic Stimulation
- TMT – (i) Thirty Meter Telescope
- TMTOWTDI – (i) There's More Than One Way To Do It (from Perl)
- TMZ – (i) Thirty-Mile Zone, an area in and around Los Angeles considered "local" under entertainment industry union work rules
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