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 Carl Frederick Kendall Palmer (born 20 March 1950) is an English drummer. He was a founding member of the supergroups Emerson, Lake & Palmer and Asia, a touring drummer for The Crazy World of Arthur Brown and a founding member of Atomic Roost ...

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 Philip Morris International Inc. (PMI) is a multinational tobacco company, with products sold in over 180 countries. Marlboro is PMI’s most recognized brand, but in the last quarter of 2023, Iqos generated the greatest revenue. Philip Mor ...

, a tobacco company

Terminology

Performance management Business performance management (BPM) (also known as corporate performance management (CPM) enterprise performance management (EPM),) is a management approach which encompasses a set of processes and analytical tools to ensure that a business o ...

of an organisation * Portfolio manager *

Preventive maintenance The technical meaning of maintenance involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure and supporting utilities in industrial, business, and residential installa ...

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 Program Manager is the shell of Windows 3.x and Windows NT 3.x operating systems. This shell exposed a task-oriented graphical user interface (GUI), consisting of ''icons'' ( shortcuts for programs) arranged into ''program groups''. It replaced ...

* 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 The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extr ...

, 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 An autopsy (also referred to as post-mortem examination, obduction, necropsy, or autopsia cadaverum) is a surgical procedure that consists of a thorough examination of a corpse by dissection to determine the cause, mode, and manner of death ...

Precision medicine Precision, precise or precisely may refer to: Arts and media * ''Precision'' (march), the official marching music of the Royal Military College of Canada * "Precision" (song), by Big Sean * ''Precisely'' (sketch), a dramatic sketch by the Eng ...

Pyridoxamine Pyridoxamine (PM) is one form of vitamin B6. Chemically it is based on a pyridine ring structure, with hydroxyl, methyl, aminomethyl, and hydroxymethyl substituents. It differs from pyridoxine by the substituent at the 4-position. The hydrox ...

, the amine form of vitamin B₆

Chemistry and materials science

*Parametric Method 3 (

PM3 (chemistry) PM3, or Parametric Method 3, is a semi-empirical method for the quantum calculation of molecular electronic structure in computational chemistry. It is based on the Neglect of Differential Diatomic Overlap integral approximation. The PM3 me ...

), in computational chemistry *

Particulate matter Particulate matter (PM) or particulates are microscopic particles of solid or liquid matter suspended in the air. An ''aerosol'' is a mixture of particulates and air, as opposed to the particulate matter alone, though it is sometimes defin ...

, microscopic particles suspended in the air ** PM10, particulates smaller than 10 μm *

Powder metallurgy Powder metallurgy (PM) is a term covering a wide range of ways in which materials or components are made from metal powders. PM processes are sometimes used to reduce or eliminate the need for subtractive manufacturing, subtractive processes in ma ...

, 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 In computer networking, a private message, personal message, or direct message (abbreviated as PM or DM) refers to a private communication, often text-based, sent or received by a user of a private communication channel on any given platform. Unli ...

, a private communication channel on some platforms

Units of measurement

Petametre The following are examples of order of magnitude, orders of magnitude for different lengths. Overview Detailed list To help compare different orders of magnitude, the following list describes various lengths between 1.6 \times 10^ me ...

(Pm), a length unit (10¹⁵ m) *

Picometre The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to , or one trillionth of ...

(pm), a length unit (10⁻¹² m) *Picomolar (pM), a unit of

molar concentration Molar concentration (also called molarity, amount concentration or substance concentration) is the number of moles of solute per liter of solution. Specifically, It is a measure of the concentration of a chemical species, in particular, of a so ...

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 The Minebea PM-9 Submachine Gun, known officially in the Japan Self-Defense Forces (JSDF) as the or as the M9, is a Japanese-made submachine gun and machine pistol. Analogous to the Israeli Uzi#Military variants, IMI Mini-Uzi, it has the same ...

, 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 The Accuracy International Arctic Warfare rifle is a bolt-action sniper rifle designed and manufactured by the British company Accuracy International. It has proved popular as a civilian, police, and military rifle since its introduction in the ...

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 Phase modulation (PM) is a signal modulation method for conditioning communication signals for transmission. It encodes a message signal as variations in the instantaneous phase of a carrier wave. Phase modulation is one of the two principal f ...

, in signal processing *

Polarization-maintaining optical fiber In fiber optics, polarization-maintaining optical fiber (PMF or PM fiber) is a single-mode optical fiber in which linear polarization, linearly polarized light, if properly launched into the fiber, maintains a linear polarization during Wave p ...

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 Saint Pierre and Miquelon ( ), officially the Territorial Collectivity of Saint Pierre and Miquelon (), is a self-governing territorial overseas collectivity of France in the northwestern Atlantic Ocean, located near the Canada, Canadian prov ...

(ISO 3166-1 alpha-2 country code) ** .pm, top-level domain (ccTLD) for Saint Pierre and Miquelon * Primitive Methodist, a Christian denomination