PF may refer to:

Arts and entertainment

Pianoforte The piano is a stringed keyboard instrument in which the strings are struck by wooden hammers that are coated with a softer material (modern hammers are covered with dense wool felt; some early pianos used leather). It is played using a keyboa ...

, full original name of the piano instrument *

Project Fanboy Project Fanboy (PF) is an American website that publishes news, interviews and reviews about the American comic book industry. In addition, the site is host to comic book fan-voted awards. It was founded by Stephen Jondrew and Scott Williams in ...

, a comic book news website

Businesses

PF Flyers PF Flyers is an American brand of Shoe, lifestyle shoes owned by Kassia Designs, LLC. Founded in 1937 by Goodrich Corporation, B.F. Goodrich, it is one of the original American sneaker brands. History In 1933, inventor Hyman L. Witman and rubb ...

, a brand of shoes *

Palestinian Airlines Palestinian Airlines was an airline headquartered in Gaza, State of Palestinepalairlines.net - Conta ...

(IATA airline designator), a defunct airline *

Pell Frischmann Pell Frischmann (PF) is a multi-disciplinary engineering consultancy based in London that provides structural and civil engineering, planning, design, and consulting services. Pell Frischmann employs over 1000 staff worldwide with 8 offices acros ...

, a multi-disciplinary engineering consultancy

Economics and finance

Point and figure chart Point and figure (P&F) is a charting technique used in technical analysis. Point and figure charting does not plot price against time as time-based charts do. Instead it plots price against changes in direction by plotting a column of Xs as the p ...

in the technical analysis of securities *

Pfennig The 'pfennig' (; . 'pfennigs' or ; symbol pf or ₰) or penny is a former German coin or note, which was the official currency from the 9th century until the introduction of the euro in 2002. While a valuable coin during the Middle Ages, i ...

, a unit of currency formerly used in Germany, symbol ₰ *

Provident Fund (disambiguation) Provident fund is another name for pension fund. Its purpose is to provide employees with lump sum payments at the time of exit from their place of employment. This differs from pension funds, which have elements of both lump sum as well as monthly ...

, name of various pension funds

Language

Phonetic form In the field of linguistics, specifically in syntax, phonetic form (PF), also known as phonological form or the articulatory-perceptual (A-P) system, is a certain level of mental representation of a linguistic expression, derived from surface struc ...

, a level of syntactic representation in linguistics *

Voiceless labiodental affricate The voiceless labiodental affricate ( in IPA) is a rare affricate consonant that is initiated as a labiodental stop and released as a voiceless labiodental fricative . The XiNkuna dialect of Tsonga has this affricate, as in "hippopotamuses" ...

(⟨p̪͡f⟩, ⟨p̪͜f⟩, or ⟨p̪f⟩), a type of consonant sound * Pf (digraph), a German digraph

People

Phineas Flynn Phineas Flynn is one of the two main protagonists from the animated television series ''Phineas and Ferb''. He is voiced by Vincent Martella. Phineas, along with his stepbrother Ferb Fletcher, stars in the A-Plot of every episode. The series c ...

Organizations

Pheasants Forever Pheasants Forever, Inc. (PF), a 501(c)(3) non-profit conservation organization, is dedicated to conserving wildlife habitat suitable for pheasants. Formed in 1982 as a response to the continuing decline of upland wildlife and habitat throughout th ...

, a non-profit habitat conservation organization *

Federal Police A law enforcement agency (LEA) is any government agency responsible for the enforcement of the laws. Jurisdiction LEAs which have their ability to apply their powers restricted in some way are said to operate within a jurisdiction. LEAs ...

(''Polícia Federal''), in Brazil *

Patients' Front The Socialist Patients' Collective (German: ''Sozialistisches Patientenkollektiv'', and known as the SPK) is a patients' collective founded in Heidelberg, West Germany, in February 1970, by Wolfgang Huber (born 1935). The kernel of the SPK's ideol ...

, a late 1960s to early 1970s West German pro-illness movement *

South Vietnamese Popular Force The South Vietnamese Popular Force ( vi, nghĩa quân, PF) (originally the Self-Defense Corps) was a part-time local militia of the Army of the Republic of Vietnam (ARVN) during the Vietnam War. The South Vietnamese Popular Force mainly protected ...

, a local defense militia formed by South Vietnam during the Vietnam War * Patriotic Front (disambiguation), name of a political party in several countries

Places

Paracel Islands The Paracel Islands, also known as the Xisha Islands () and the Hoang Sa Archipelago ( vi, Quần đảo Hoàng Sa, lit=Yellow Sand Archipelago), are a disputed archipelago in the South China Sea. The archipelago includes about 130 small coral ...

, FIPS PUB 10-4 territory code *

French Polynesia )Territorial motto: ( en, "Great Tahiti of the Golden Haze") , anthem = , song_type = Regional anthem , song = " Ia Ora 'O Tahiti Nui" , image_map = French Polynesia on the globe (French Polynesia centered).svg , map_alt = Location of Frenc ...

(Polynésie française), by ISO 3166 code **

.pf .pf is the Internet country code top-level domain (ccTLD) for French Polynesia. The name ''pf'' derived from the French name of '. A local contact has to be appointed to register a domain name under .pf. The only 2nd level domain available for p ...

, internet country code for French Polynesia *

Pforzheim Pforzheim () is a city of over 125,000 inhabitants in the federal state of Baden-Württemberg, in the southwest of Germany. It is known for its jewelry and watch-making industry, and as such has gained the nickname "Goldstadt" ("Golden City") ...

and Enzkreis district, Germany (vehicle plate code PF)

Science and technology

Computing

, internet country code for French Polynesia *

PF (firewall) PF (Packet Filter, also written pf) is a BSD licensed stateful packet filter, a central piece of software for firewalling. It is comparable to netfilter (iptables), ipfw, and ipfilter. PF was developed for OpenBSD, but has been ported to man ...

, OpenBSD's stateful packet filter *

PF keys A function key is a key on a computer or terminal keyboard that can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function ...

, a type of function keys on old keyboards *

Page fault In computing, a page fault (sometimes called PF or hard fault) is an exception that the memory management unit (MMU) raises when a process accesses a memory page without proper preparations. Accessing the page requires a mapping to be added to t ...

, a type of exception (error) in computer programming *

Page file In computer operating systems, memory paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory. In this scheme, the operating system retrieves data from secondary storag ...

, a file used as an extension for computer memory

Physics

Power factor In electrical engineering, the power factor of an AC power system is defined as the ratio of the '' real power'' absorbed by the load to the ''apparent power'' flowing in the circuit. Real power is the average of the instantaneous product of v ...

, or cos phi, of an AC electric power system *

Purple fringing In photography (particularly digital photography), purple fringing (sometimes called PF) is the term for an unfocused purple or magenta "ghost" image on a photograph. This optical aberration is generally most visible as a coloring and lightenin ...

, a type of chromatic aberration in photography *

Phenol formaldehyde resin Phenol formaldehyde resins (PF) or phenolic resins (also infrequently called phenoplasts) are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. Used as the basis for Bakelite, PFs were the first commerc ...

, the earliest synthetic polymer * Picofarad (pF) or petafarad (PF), multiples of

farad The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI). It is named after the English physicist Michael Faraday (1791–1867). In SI base unit ...

, the SI unit of electric capacitance *

Photon Factory The Photon Factory (PF) is a synchrotron located at KEK, in Tsukuba, Japan, about fifty kilometres from Tokyo. There are two major facilities, the Photon Factory itself which is a 2.5GeV synchrotron with a beam current of around 450mA, and the ...

, a synchrotron located at KEK in Tsukuba, Japan

In other sciences and mathematics

* pf(A), the

Pfaffian In mathematics, the determinant of a skew-symmetric matrix can always be written as the square of a polynomial in the matrix entries, a polynomial with integer coefficients that only depend on the size of the matrix. The value of this polynomial, ...

of a matrix A *

Phenylphosphine Phenylphosphine is an organophosphorus compound with the chemical formula C6H5PH2. It is the phosphorus analog of aniline. Like other primary phosphines, phenylphosphine has an intense penetrating odor and is highly oxidizable. It is mainly used ...

, an organophosphorus compound * ''

Plasmodium falciparum ''Plasmodium falciparum'' is a Unicellular organism, unicellular protozoan parasite of humans, and the deadliest species of ''Plasmodium'' that causes malaria in humans. The parasite is transmitted through the bite of a female ''Anopheles'' mosqu ...

'', a species of Plasmodium that causes malaria in humans *

Polar front In meteorology, the polar front is the weather front boundary between the polar cell and the Ferrel cell around the 60° latitude, near the polar regions, in both hemisphere. At this boundary a sharp gradient in temperature occurs between these ...

, in meteorology *

Position fix Geopositioning, also known as geotracking, geolocalization, geolocating, geolocation, or geoposition fixing, is the process of determining or estimating the geographic position of an object. Geopositioning yields a set of geographic coordinates ...

, a position derived from measuring external reference points *

Psychometric function Psychometrics is a field of study within psychology concerned with the theory and technique of measurement. Psychometrics generally refers to specialized fields within psychology and education devoted to testing, measurement, assessment, and ...

, an inferential psychometric model

Sports

Personal foul (disambiguation) Personal foul may refer to: Sports Rules * Personal foul (American football), a type of penalty in American football * Personal foul (basketball) In basketball, a personal foul is a breach of the rules that concerns illegal personal contact ...

, a type of foul in several sports * Power forward (disambiguation), a type of position in several sports

Other uses

*PF, the United States Navy hull classification symbol for

patrol frigate A frigate () is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied somewhat. The name frigate in the 17th to early 18th centuries was given to any full-rigged ship built for speed and ...

*Peregrine Falcons Squad, a faction in the ''

Metal Slug is a Japanese Shoot 'em up#Scrolling shooters, run and gun video game series originally created by Nazca Corporation before merging with SNK Playmore, SNK in 1996 after the completion of the Metal Slug (1996 video game), first game in the seri ...

'' series of video games *

Pilot flying In commercial aviation with a two-person flight crew, the pilot flying (PF) is the pilot operating the flight controls of the aircraft. The other pilot is referred to as the pilot monitoring (PM) or pilot not flying (PNF). Before a flight departs, ...

, in commercial aviation, a designation for the pilot in control of an aircraft * Pour féliciter, text on New Year card * Procurator fiscal, the public prosecutor in Scotland *

Public forum debate Public Forum debate is a widespread form of middle and high school competitive debate which centers on current events and relies on both logic and evidence to construct arguments. Invented in the US, Public Forum is one of the most prominent Americ ...

, a debate sanctioned by the National Forensic League * Pekoe Fannings, a grade of tea leaves *

Horowitz index The Horowitz index or Horovitz index (also known as the Horowitz quotient or the P/F ratio) is a ratio used to assess lung function in patients, particularly those on ventilators. It is useful for evaluating the extent of damage to the lungs. The ...

(PF), blood oxygenation