PTR
# PTR

PTR can refer to:

* Particle transfer roller, for cleaning motion picture film
* Peak-to-trough ratio, a parameter in pharmacokinetics
* Petir LRT station (LRT station abbreviation), Singapore
* PetroChina (NYSE: PTR)
* Photothermal Ratio, light/temperature ratio for a plant
* Physical transmission right in the electricity market
* Physikalisch-Technische Reichsanstalt, later Physikalisch-Technische Bundesanstalt, a German research institute
* Pitrilysin, an enzyme
* Planar ternary ring in algebra
* Pool Test Reactor, Canada
* Proton-transfer-reaction mass spectrometry, used in chemical analysis
* PTR rifle, made by PTR Industries, Inc., US
* A type of DNS record in computer networking
* Pointer in computer programming (e.g. the PTR keyword in x86 assembly language)
* Palanivel Thiagarajan, an Indian politician
* Puerto Rico, ITU country code
* Public Test Realm, a server in Overwatch where updates are tested by developers for player feedback
