PPO may refer to:

Law enforcement

Personal Protection Officer A personal protection officer (PPO) is an officer of the Metropolitan Police Protection Command who is assigned for the personal protection of members of the British royal family, the prime minister, government ministers, ambassadors, visiting head ...

Personal Protection Order A restraining order or protective order, is an order used by a court to protect a person in a situation involving alleged domestic violence, child abuse, assault, harassment, stalking, or sexual assault. Restraining and personal protection or ...

Police protection order In England and Wales, Police child protection powers concern the powers of the individual local police forces to intervene to safeguard children. These powers are governed by Section 46 of the Children Act 1989. Under this law, the police have the ...

Prisons and Probation Ombudsman The 'Prisons and Probation Ombudsman'' (PPO) is a public body, in England and Wales, appointed by the Secretary of State for Justice to investigate complaints from prisoners, those subject to probation supervision, young people in detention (prison ...

Chemistry and biochemistry

2,5-Diphenyloxazole 2,5-Diphenyloxazole (PPO) is an organic scintillator. It is used as a wavelength shifter (also called a "primary shifter" or "fluor"), which means that it converts shorter wavelength light to longer wavelength light. Its output spectrum peaks at 3 ...

, an organic

scintillator A scintillator is a material that exhibits scintillation, the property of luminescence, when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate (i.e. re-emit the absorbed ...

Polyphenol oxidase Polyphenol oxidase (PPO; also polyphenol oxidase i, chloroplastic), an enzyme involved in fruit browning, is a tetramer that contains four atoms of copper per molecule. PPO may accept monophenols and/or ''o''-diphenols as substrates. The ...

s, a family of enzymes * Poly(p-phenylene oxide), a type of plastic * Propylene oxide, an industrial chemical *

Protoporphyrinogen oxidase Protoporphyrinogen oxidase or protox is an enzyme that in humans is encoded by the ''PPOX'' gene. Protoporphyrinogen oxidase is responsible for the seventh step in biosynthesis of protoporphyrin IX. This porphyrin is the precursor to hemoglobin, ...

, an enzyme *

Pure plant oil Vegetable oil can be used as an alternative fuel in diesel engines and in heating oil burners. When vegetable oil is used directly as a fuel, in either modified or unmodified equipment, it is referred to as straight vegetable oil (SVO) or pure pl ...

Other uses

* Pfadfinder und Pfadfinderinnen Österreichs, an Austrian Scouting organization * Planned

purchase order A purchase order is a commercial document and first official offer issued by a buyer to a seller, indicating types, quantities, and agreed prices for products or services. It is used to control the purchasing of products and services from externa ...

, part of the purchasing process *

Polish Patent Office The Polish Patent Office (PPO) ( pl, Urząd Patentowy Rzeczypospolitej Polskiej (UPRP)) is the patent office of Poland. It is based in Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa' ...

Political Parties Order, 2002 The Political Parties Order, 2002 was an executive order in Pakistan stating that any person can become a member of a political party as long as they are not in the service of Pakistan and that a person cannot become a political party office-beare ...

, a chief executive order in Pakistan *

Preferred provider organization In U.S. health insurance, a preferred provider organization (PPO), sometimes referred to as a participating provider organization or preferred provider option, is a managed care organization of medical doctors, hospitals, and other health care ...

, a type of health insurance plan *

Toray Pan Pacific Open The Pan Pacific Open ( ja, 東レパン・パシフィック・オープン・テニストーナメント), currently sponsored by Toray Industries, is a women's outdoor hardcourt tennis tournament held annually in Tokyo, Japan. It is a WTA 500-l ...

, a Women's Tennis Association tournament * Philippine Philharmonic Orchestra * Abbreviation of Praefectus Praetorio (Praetorian Prefect), found on inscriptions *

Proximal Policy Optimization Proximal Policy Optimization (PPO) is a family of model-free reinforcement learning algorithms developed at OpenAI in 2017. PPO algorithms are policy gradient methods, which means that they search the space of policies rather than assigning va ...

, a family of reinforcement learning algorithms (part of computer science) * Pédagogie par Objectifs-Melkart 2021 *

Populist Party Ontario The Populist Party Ontario (french: Parti Populiste Ontario, PPO) is a minor political party in Ontario, Canada. The party began its registration process with Elections Ontario upon Shelley Batcules' request on December 17, 2021, and its party na ...

, a minor provincial political party in Ontario, Canada {{disambig