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
• PaRappa the Rapper

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