# PM

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

### Terminology

* Performance management of an organisation
* Portfolio manager
* Preventive maintenance
* Project manager
* Product manager
* Program manager
* Product marketer

## Government

* Prime minister
* 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 B$_6$

### 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, 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 (10$^{15}$ 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, 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