PM or pm (also written P.M. or p.m.) is an abbreviation for Latin ''post meridiem'', meaning "after midday" in the

12-hour clock The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin , translating to "before midday") and p.m. (from Latin , translating to "after midday"). Each period consists of 12&nb ...

. PM or Pm or pm may also refer to:

Arts and entertainment

* Palm mute, a guitar playing technique * ''PM'' (radio program), Australia * ''PM'' (BBC Radio 4), UK *'' PM Magazine'', an American TV news program (1976–1991). * ''PM'' (newspaper), US (1940–1948) * PM Press, an American publishing company *'' Pocket Mortys'', a role-playing video game * Project Mayhem, a fictional conspiracy in the book and film ''Fight Club'' * PM, a band with drummer Carl Palmer.

Business and economics

Businesses

* P.M. Place Stores, a former US chain of discount stores *

Pere Marquette Railway The Pere Marquette Railway was a railroad that operated in the Great Lakes (North America), Great Lakes region of the United States and southern parts of Ontario in Canada. It had trackage in the states of Michigan, Ohio, Indiana, and the Canadi ...

, North America 1900–1947, reporting mark * Philip Morris International, a tobacco company

Terminology

* Performance management of an organisation * Portfolio manager * Preventive maintenance *

Project manager A project manager is a professional in the field of project management. Project managers have the responsibility of the Project planning, planning, procurement and execution of a project, in any undertaking that has a defined scope, defined star ...

* Product manager * Program manager * Product marketer

Government

Prime minister A prime minister or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but r ...

* Polícia Militar, Brazilian military police *U.S. Department of State Bureau of Political-Military Affairs

People

* P.M. (author) or p.m., pseudonym of Hans Widmer (born 1947), Swiss author * Pat Maloney Sr. (1924–2005), American trial lawyer

Science, technology, and mathematics

Biology and medicine

* Plasma membrane, also known as cell membrane * Polymyositis, a disease * Poor metabolizer, a term used in pharmacogenomics to refer to individuals with little to no functional metabolic activity * Post-mortem * Precision medicine * Pyridoxamine, the amine form of vitamin B₆

Chemistry and materials science

*Parametric Method 3 ( PM3 (chemistry)), in computational chemistry * Particulate matter, microscopic particles suspended in the air ** PM10, particulates smaller than 10 μm * Powder metallurgy, a method of fabricating metals *

Promethium Promethium is a chemical element; it has Symbol (chemistry), symbol Pm and atomic number 61. All of its isotopes are Radioactive decay, radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in the Earth's crust a ...

, symbol Pm, a chemical element

Computing

* Particle mesh, an algorithm for determining forces * Perl module, file extension .pm * Private message, a private communication channel on some platforms

Units of measurement

* Petametre (Pm), a length unit (10¹⁵ m) * Picometre (pm), a length unit (10⁻¹² m) *Picomolar (pM), a unit of molar concentration

Vehicles

*Martin PM, a version of the Naval Aircraft Factory PN flying boat * Toyota PM, a concept car * Pm36, a Polish steam locomotive

Weapons

Guns and mortars

* Makarov PM (Pistolet Makarova), a Soviet and Russian pistol * Minebea PM-9, a Japanese submachine gun * PM-38, a Soviet light mortar * PM-63 RAK, Polish submachine gun * PM-84 Glauberyt, Polish submachine gun * PM md 96, a Romanian submachine gun *Precision Marksman (PM), a sniper rifle and precursor to the accuracy international arctic warfare rifle

Mines

* PM-43 and PM-68 mine, Finland * PM-60 mine, East Germany * PM-79 mine, Bulgaria

Other uses in science, technology, and mathematics

* PM-1, PM-2A, PM-3A, US Army portable nuclear reactors * Phase modulation, in signal processing * Polarization-maintaining optical fiber or PM fiber *''

Principia Mathematica The ''Principia Mathematica'' (often abbreviated ''PM'') is a three-volume work on the foundations of mathematics written by the mathematician–philosophers Alfred North Whitehead and Bertrand Russell and published in 1910, 1912, and 1 ...

'', by Whitehead and Russell *The plus or minus sign, a symbol used in mathematics

Other uses

* Passage Meditation, a form of meditation developed by Eknath Easwaran * Pickleball Manitoba, Canadian provincial pickleball association * Saint Pierre and Miquelon (ISO 3166-1 alpha-2 country code) ** .pm, top-level domain (ccTLD) for Saint Pierre and Miquelon * Primitive Methodist, a Christian denomination