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
PetroChina Company Limited () is a Chinese oil and gas company and is the listed arm of state-owned China National Petroleum Corporation (CNPC), headquartered in Dongcheng District, Beijing. The company is currently Asia's largest oil and gas pr ...
(NYSE: PTR)
*
Photothermal Ratio, light/temperature ratio for a plant
*
Physical transmission right in the electricity market
*
Physikalisch-Technische Reichsanstalt
The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under fed ...
, later Physikalisch-Technische Bundesanstalt, a German research institute
*
Pitrilysin
Pitrilysin (, ''Escherichia coli protease III'', ''protease Pi'', ''proteinase Pi'', ''PTR'', ''Escherichia coli metalloproteinase Pi'') is an enzyme. This enzyme catalyses the following chemical reaction:
: Preferential cleavage of -Tyr16- Leu- ...
, an enzyme
*
Planar ternary ring in algebra
*
Pool Test Reactor, Canada
*
Proton-transfer-reaction mass spectrometry, used in chemical analysis
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PTR rifle, made by PTR Industries, Inc., US
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A type of DNS record in computer networking
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Pointer
Pointer may refer to:
Places
* Pointer, Kentucky
* Pointers, New Jersey
* Pointers Airport, Wasco County, Oregon, United States
* The Pointers, a pair of rocks off Antarctica
People with the name
* Pointer (surname), a surname (including a list ...
in computer programming (e.g. the PTR keyword in x86 assembly language)
*
Palanivel Thiagarajan, an Indian politician
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