PM

PM (also written P.M., p.m., and pm) often means "after noon" in the 12-hour clock (Latin Post meridiem).

PM or Pm may also refer to:

Sciences

Particulate matter, particulates — fine dust and soot — suspended in the air
- PM10, particulates, smaller than 10 μm, that can cause health problems
PM3 (chemistry), or Parameterized Model number 3 - a modelling method in computational chemistry
Permanent magnet, an object which stays magnetised without external effort or mason.
Perpetual motion, refers to movement that goes on forever
Petameter, a length unit (10¹⁵ m) (Pm)
Phase modulation, in electrical engineering
PM tube, Photomultiplier tube.
Picometre, a length unit (10⁻¹² m) (pm)
Plasma membrane, is a selectively permeable lipid bilayer found in all cells
Powdery mildew, a fungal disease that affects a wide range of plants
Powder metallurgy, a method of fabricating metals.
Premolar tooth, dental nomenclature
Promethium, chemical element number 61 (Pm)
Polymyositis, disease
Post mortem, a medical examination carried out after death
Principia Mathematica, a three-volume work on the foundations of mathematics
Polarization-maintaining optical fiber
Participatory medicine, a new model of medicine

P.M. (author), an anonymous Swiss author
P. M. Aboobacker, Indian Muslim political leader in Kerala
P. M. Blau (1918–2002), American sociologist and theorist; see Peter Blau
P. M. Cohn (1924–2006), German-born British mathematician; Paul Cohn
P.M. Daka, Zambian member of Pan-African Parliament; see Peter Daka
P. M. Henry (1849–1903), or Prosper Henry, French optician and astronomer; see Paul Henry and Prosper Henry
P. M. Hubbard (1910–1980), British writer
P. M. Kilmartin, New Zealand astronomer; see Pamela M. Kilmartin
P.M. McCullough (1893–1981), American actor; see Philo McCullough
P. M. Pasinetti (1913–2006), Italian novelist, professor and journalist
P. M. Pu (1910–1988), Chinese mathematician; see Pao Ming Pu
P. M. Radhakrishnan (1946–2010), Indian football player, coach, referee and administrator
P. M. Sayeed (1941–2005), Indian politician, representing Lakshadweep
P. M. Thangavelraj, Indian politician, former Member of the Legislative Assembly of Tamil Nadu

Pac-Man, character, video game, and TV series
Paper Mario, game for Nintendo 64
Particle Mesh, an algorithm for calculating the potential of a system (used in computational physics).
Perl module, a discrete component of software for the Perl programming language. (file extension .pm)
Perl mongers - groups of local Perl enthusiasts.
Personal message or private message, a type of e-mail within community sites or chat between two people.

PM-1, American nuclear reactor.
Prime minister, the most senior minister of a cabinet
Preventive maintenance, a job for fault prevention during machine executes before occurring some problems.
Pontifex Maximus, the high priest of the Ancient Roman College of Pontiffs
Postmaster, the head of an individual post office
Palace Museum, a large art museum housed in the Forbidden City in Beijing
Polar Medal, a medal awarded by the Sovereign of the United Kingdom
Saint Pierre and Miquelon: ISO 3166-1 alpha-2 country code
- .pm, the country code top level domain (ccTLD) for Saint Pierre and Miquelon
Performance management: activities to ensure that goals are consistently being met in an effective and efficient manner.