PM

PM, Pm, pm or p.m. can refer to:

Science

• Particulate matter, fine dust and soot suspended in the air
• Permanent magnet, an object which stays magnetised without external effort
• Perpetual motion, refers to movement that goes on forever
• Petametre, a length unit (10¹⁵ m) (Pm)
• Phase modulation, in electrical engineering
• Picometre, a length unit (10^-12 m) (pm)
• Plasma membrane, is a selectively permeable lipid bilayer found in all cells
• Post meridiem (also written P.M., p.m., and pm), Latin for "after noon", used to disambiguate hours of the day in the twelve-hour clock system
• Powdery mildew, a fungal disease that affects a wide range of plants
• Precious metal, a rare metallic chemical element of high economic value
• Promethium, chemical element number 61 (Pm)
• Preventive maintenance, preventive maintenance (Pm)

Medicine

• Polymyositis
• Post mortem, a medical examination carried out after death

Mathematics

• Principia Mathematica, a three-volume work on the foundations of mathematics

Computing

• Perl module, a discrete component of software for the Perl programming language
• Personal message or private message, in the context of bulletin board systems and Internet forums

Politics

• Pontifex Maximus, the high priest of the Ancient Roman College of Pontiffs
• Prime minister, the most senior minister of a cabinet
• Pubblico Ministero, an Italian magistrate's office

Economy

• Altria Group, previously named "Phillip Morris"
• Pobjoy Mint, a European mint, via its mint mark "PM"
• Postmaster, the head of an individual post office
• Project manager or project management, the discipline of organizing and managing resources
• Power Machines or Silmash, a Russian industrial company

Literature

• Perry Mason, a fictional defense attorney
• The Peoples of Middle-earth by Christopher Tolkien
• Popular Mechanics, an American magazine devoted to science and technology
• P.M. (author), an anonymous Swiss author

Media

• PM (Radio 4), a BBC Radio 4, a news and current affairs programme
• PM (ABC Radio), an ABC Radio national news magazine programme
• PM (newspaper), a politically leftist U.S. newspaper in the 1940s

Other

• Palm mute, in guitar tablature
• Pere Marquette Railway (Association of American Railroads reporting mark PM)
• Pistolet Makarova, a semi-automatic pistol designed in the late 1940s
• Polar Medal, a medal awarded by the Sovereign of the United Kingdom
• Preventive maintenance, preventative maintenance or proactive maintenance, the care and servicing of equipment for the purpose of maintaining it in satisfactory operating condition
• Saint-Pierre and Miquelon: ISO 3166-1 alpha-2 country code
• Tropic Air IATA airline designator