title: PTR
text: # 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
  