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Psi, PSI or Ψ may refer to:


Alphabetic letters

*
Psi (Greek) Psi (uppercase , lowercase or ; ''psi'' ) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination (as in ...
(Ψ or ψ), the twenty-third letter of the Greek alphabet *
Psi (Cyrillic) Psi (Ѱ, ѱ; italics: ) is a letter in the early Cyrillic alphabet, derived from the Greek letter of the same name (Ψ, ψ). It represents the sound /ps/, as in English ''naps''. According to the school rules developed in the 16th and the 17th ...
, letter of the early Cyrillic alphabet, adopted from Greek


Arts and entertainment

* "Psi" as an abbreviation for
psionics In American science fiction of the 1950s and '60s, psionics was a proposed discipline that applied principles of engineering (especially electronics) to the study (and employment) of paranormal or psychic phenomena, such as extrasensory perceptio ...


Comics

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Psi (comics) Psi (Gayle Marsh) is a supervillain appearing in media published by DC Comics, primarily as an enemy of Supergirl. She was created by Paul Kupperberg and Carmine Infantino, and first appeared in ''The Daring New Adventures of Supergirl'' #1 (Novem ...
, DC Comics character * Psi Division, division in the ''
Judge Dredd Judge Joseph Dredd is a fictional character created by writer John Wagner and artist Carlos Ezquerra. He first appeared in the second issue of the British weekly anthology Comic book, comic ''2000 AD (comics), 2000 AD'' (1977). He is the magazi ...
'' and ''2000 AD'' series of comics * ''
Psi-Force ''Psi-Force'' is a comic book series created by Archie Goodwin and Walt Simonson and published by Marvel Comics under their New Universe imprint from 1986 to 1989. It ran for 32 issues and an annual (October 1987). It concerned a group of ...
'', comic series *
Psi-Hawk ''Psi-Force'' is a comic book ongoing series, series created by Archie Goodwin (comics), Archie Goodwin and Walt Simonson and published by Marvel Comics under their New Universe imprint from 1986 in comics, 1986 to 1989 in comics, 1989. It ran for ...
, comic character * '' Psi Lords'', comic series


Music

* ''PSI'' (album), album by Pitchshifter (2002) *
Psi Com Psi Com was an American post-punk band of the early 1980s, consisting of Perry Farrell (vocals), Aaron Sherer (drums and percussion), Vince Duran (guitar) and Kelly Wheeler (bass). Prominent in the underground Los Angeles music scene, the group ...
, 1980s rock band * Psi Power, song by rock group Hawkwind (1978) *
Psi Records Psi Records is an independent record label that was founded by saxophonist Evan Parker, and that focuses on free improvisation Free improvisation or free music is improvised music without any general rules, instead following the intuition of ...
, music record label *
PSI Records Psi Records is an independent record label that was founded by saxophonist Evan Parker, and that focuses on free improvisation Free improvisation or free music is improvised music without any general rules, instead following the intuition of ...
, music record label * Ψ CMX DVD, Finnish language video album by the band CMX * ''Pitch Shifter Industries'', acronym used by the British band Pitchshifter * Logo used by the band Twenty One Pilots during their '' Scaled and Icy'' (2021) album era


Other uses in arts and entertainment

* ''Psi'' (TV series), Brazil * Psi Corps, in the ''Babylon 5'' fictional universe * '' Psi Factor: Chronicles of the Paranormal'', Canadian television series * '' Psi-Ops: The Mindgate Conspiracy'', 2004 video game


Organizations


Government and politics

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Italian Socialist Party The Italian Socialist Party (, PSI) was a Social democracy, social democratic and Democratic socialism, democratic socialist political party in Italy, whose history stretched for longer than a century, making it one of the longest-living parti ...
(''Partito Socialista Italiano''), socialist and later social-democratic political party in Italy *
Italian Socialist Party (2007) The Italian Socialist Party (, PSI) is a social-democratic political party in Italy. The party was founded in 2007–2008 by the merger of the following social-democratic parties and groups: Enrico Boselli's Italian Democratic Socialists (legal ...
, social-democratic political party in Italy *
Indonesian Solidarity Party The Indonesian Solidarity Party (, PSI) is a List of political parties in Indonesia, political party in Indonesia that focuses on women's rights, Pluralism (political theory), pluralism, and Indonesian youth. It is led by Kaesang Pangarep who is t ...
(''Partai Solidaritas Indonesia'') *
Indonesian Socialist Party The Socialist Party of Indonesia (, PSI) was a socialist political party in Indonesia which existed from 1948 until 1960, when it was banned by President Sukarno. Origins In December 1945, Amir Sjarifoeddin's Socialist Party of Indonesia (P ...
(''Partai Sosialis Indonesia'') *
Proliferation Security Initiative The Proliferation Security Initiative (PSI) is a global effort that aims to stop trafficking of weapons of mass destruction (WMD), their delivery systems, and related materials to and from states and non-state actors of proliferation concern. ...
, against weapons technology transfer * ''Public Sector Information'', as in: ** The 2003 EU
Directive on the re-use of public sector information Directive 2003/98/EC on the re-use of public sector information, known as the PSI Directive,
...
** The UK
Office of Public Sector Information The Office of Public Sector Information (OPSI) is the body responsible for the operation of His Majesty's Stationery Office (HMSO) and of other public information services of the United Kingdom. The OPSI is part of the National Archives of the U ...
(OPSI), formerly HMSO *
United States Senate Homeland Security Permanent Subcommittee on Investigations The Permanent Subcommittee on Investigations (PSI), stood up in March 1941 as the "Truman Committee," is the oldest subcommittee of the United States Senate Committee on Homeland Security and Governmental Affairs (formerly the Committee on Govern ...


Other organizations

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Paul Scherrer Institute The Paul Scherrer Institute (PSI) is a multi-disciplinary research institute for natural and engineering sciences in Switzerland. It is located in the Canton of Aargau in the municipalities Villigen and Würenlingen on either side of the Ri ...
, research institute in Villigen, Switzerland *
Pechersk School International Pechersk School International (PSI) is a school located in Kyiv, Ukraine. It provides education ranging from the early childhood-level, to the end of the IB diploma-programme. PSI is a dynamic, diverse, not-for-profit international school community ...
, Kyiv, Ukraine * Physics Society of Iran *
Planetary Science Institute The Planetary Science Institute (PSI) is a 501(c)(3) non-profit research institute based in Tucson, Arizona, focusing on planetary science. , its director is Dr. Mark V. Sykes. PSI, along with Space Science Institute (SSI) Southwest Researc ...
, Tucson, Arizona, US * Poetry Slam, Inc., promoting poetry *
Policy Studies Institute The Policy Studies Institute (PSI) is a British think-tank and research institute. PSI began in 1931 as Political and Economic Planning and became the Policy Studies Institute in 1978 on its merger with the Centre for Studies in Social Policy (est ...
, UK research organization *
Population Services International Population Services International (PSI) is a 501(c)(3) registered nonprofit organization, nonprofit global health organization that began as an international not-for-profit provider of contraception and safe abortion services, and has evolved int ...
, global health organization * Professional Skills Institute, technical school in Maumee, Ohio, US * Prudential Securities Incorporated, financial services company * PSI Seminars, on awareness training *
Public Services International Public Services International (PSI) is the global union federation for workers in public services, including those who work in social services, health care, municipal services, central government and public utilities. , PSI has 700 affiliated ...
, trades unions federation * Statisticians in the Pharmaceutical Industry


Parapsychology

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Psi (parapsychology) Parapsychology is the study of alleged psychic phenomena ( extrasensory perception, telepathy, teleportation, precognition, clairvoyance, psychokinesis (also called telekinesis), and psychometry) and other paranormal claims, for example, thos ...
, psychic or paranormal phenomena * Psi hit, parapsychological experimentation term *
Paranormal Site Investigators United Kingdom charity Paranormal Site Investigators (PSI) is dedicated to advancing education, research and heritage in the area of anomalous experience. The charity has a membership of around 1400. The charity patron is Peter Underwood. PSI ...
, in the UK


Science, technology, and mathematics


Biology and medicine

* PSI (prion), infectious protein in yeast * Pandemic severity index, former US CDC influenza scale *
Photosystem I Photosystem I (PSI, or plastocyanin–ferredoxin oxidoreductase) is one of two photosystems in the Light-dependent reactions, photosynthetic light reactions of algae, plants, and cyanobacteria. Photosystem I is an integral membrane ...
, protein complex involved in photosynthesis *
Pneumonia severity index The pneumonia severity index (PSI) or PORT Score is a clinical prediction rule that medical practitioners can use to calculate the probability of morbidity and mortality among patients with community acquired pneumonia. The PSI/PORT score is of ...
* Protein Structure Initiative, of the U.S. NIGMS


Computing

* Psi (instant messaging client), XMPP client program * Potentially Shippable Increment, in the Scrum software development methodology * Program-specific information, part of the MPEG transport stream protocol * Pressure stall information, a Linux kernel patch for
out of memory Out of memory (OOM) is an often undesired state of computer operation where no additional memory can be allocated for use by programs or the operating system. Such a system will be unable to load any additional programs, and since many programs ...
management


Cryptography

* Private set intersection, a cryptographic technique to compute the intersection of two encrypted sets


Economics

*
PSI-20 The PSI-20 (an acronym of Portuguese Stock Index) is a benchmark stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal. The index tracks the prices of the twenty listings with the largest market capita ...
, Lisbon, Portugal stock market index * Private sector involvement, in sovereign debt crisis resolution


Engineering

* "Yaw" angle, one of the
Euler angles The Euler angles are three angles introduced by Leonhard Euler to describe the Orientation (geometry), orientation of a rigid body with respect to a fixed coordinate system.Novi Commentarii academiae scientiarum Petropolitanae 20, 1776, pp. 189†...
, denoted ψ in aerospace engineering * Present serviceability index, a pavement performance indicator introduced by AASHTO


Geography

* Psi Islands, in the Melchior Islands, Antarctica


Mathematics

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Chebyshev function In mathematics, the Chebyshev function is either a scalarising function (Tchebycheff function) or one of two related functions. The first Chebyshev function or is given by :\vartheta(x) = \sum_ \log p where \log denotes the natural logari ...
* Dedekind psi function *
Digamma function In mathematics, the digamma function is defined as the logarithmic derivative of the gamma function: :\psi(z) = \frac\ln\Gamma(z) = \frac. It is the first of the polygamma functions. This function is Monotonic function, strictly increasing a ...
*
Polygamma function In mathematics, the polygamma function of order is a meromorphic function on the complex numbers \mathbb defined as the th derivative of the logarithm of the gamma function: :\psi^(z) := \frac \psi(z) = \frac \ln\Gamma(z). Thus :\psi^(z) ...
s *
Stream function In fluid dynamics, two types of stream function (or streamfunction) are defined: * The two-dimensional (or Lagrange) stream function, introduced by Joseph Louis Lagrange in 1781, is defined for incompressible flow, incompressible (divergence-free ...
, in two-dimensional flows * Polar tangential angle of a curve * Probability of ultimate ruin, in
ruin theory In actuarial science and applied probability, ruin theory (sometimes risk theory or collective risk theory) uses mathematical models to describe an insurer's vulnerability to insolvency/ruin. In such models key quantities of interest are the proba ...
*
Supergolden ratio In mathematics, the supergolden ratio is a geometrical aspect ratio, proportion, given by the unique real polynomial root, solution of the equation Its decimal expansion begins with . The name ''supergolden ratio'' is by analogy with the golde ...
*
Reciprocal Fibonacci constant The reciprocal Fibonacci constant is the sum of the reciprocals of the Fibonacci numbers: \psi = \sum_^ \frac = \frac + \frac + \frac + \frac + \frac + \frac + \frac + \frac + \cdots. Because the ratio of successive terms tends to the reciproc ...
* Population Stability Index ( Kullback–Leibler divergence#Symmetrised divergence)


Physics and chemistry

*
Pound per square inch The pound per square inch (abbreviation: psi) or, more accurately, pound-force per square inch (symbol: lbf/in2), is a unit of measurement of pressure or of stress based on avoirdupois units and used primarily in the United States. It is the pre ...
, unit of pressure *
PSI (computational chemistry) Psi is an Ab initio quantum chemistry methods, ab initio computational chemistry package originally written by the research group of Henry F. Schaefer, III (University of Georgia). Utilizing Psi, one can perform a calculation on a molecular system ...
, software *
J/psi meson The (J/psi) meson is a subatomic particle, a flavor-neutral meson consisting of a charm quark and a charm antiquark. Mesons formed by a bound state of a charm quark and a charm anti-quark are generally known as " charmonium" or psions. The ...
, subatomic particle * Porous silicon ("PS" or "pSi"), a form of silicon with introduced nanopores in its microstructure *
Water potential Water potential is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure and mat ...
, denoted Ψ, in physical chemistry, the potential energy of a water solution relative to pure water *
Wave function In quantum physics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common symbols for a wave function are the Greek letters and (lower-case and capital psi (letter) ...
, denoted ψ, in quantum mechanics


Psychology

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Psychology Psychology is the scientific study of mind and behavior. Its subject matter includes the behavior of humans and nonhumans, both consciousness, conscious and Unconscious mind, unconscious phenomena, and mental processes such as thoughts, feel ...
or psychologist, denoted Ψ, used in the logo of various psychological associations *
Psi Chi Psi Chi () is a college student honor society in psychology with international outreach founded in 1929 at the University of Kansas in the United States. Psi Chi is one of the largest honor societies in the United States, with more than 1,100 chap ...
, the National Honor Society in psychology *
Psi-theory Psi-theory, developed by Dietrich Dörner at the University of Bamberg, is a systemic psychological theory covering human action regulation, intention selection and emotion.Dörner, D., Bartl, C., Detje, F., Gerdes, J., Halcour, D., Schaub, H., S ...
, theory about the human mind, a cognitive architecture * Psychiatric Solutions, Inc., corporation that owns psychiatric hospitals


Other uses

* Parasocial interaction, non-reciprocal interactions, as between a fanbase and a performer * Permanent staff instructor, in the British Army * Personalized System of Instruction *
Pollutant Standards Index The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, which is a number used to indicate the level of pollutants in air. Initially PSI was based on five air pollutants, but since 1 April 2014 it has also include ...
, air pollution measure *
Pre-shipment inspection Pre-shipment inspection (also preshipment inspection or PSI) is a part of supply chain management and an important quality control method for checking the quality of goods clients buy from suppliers. PSI helps ensure that production complies with ...
, method of quality control * Presentence investigation report, investigation into the history of person convicted of a crime * Proto-Siouan language, the reconstructed ancestor of the Siouan languages


See also

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Psy (disambiguation) Psy (full name: Park Jae-sang; born 1977) is a South Korean singer best known for his hit single "Gangnam Style". Psy or PSY may also refer to: * Psy (film), ''Psy'' (film), a 1992 film directed by Władysław Pasikowski * Psychedelic trance, or ...
*
PS1 (disambiguation) PS1, Ps 1, PS-1, PS/1 or PS One may refer to: Arts and entertainment * MoMA PS1 (derived from "Public School One"), American contemporary art institution * ''Ponniyin Selvan: I'' or ''PS I'', a 2022 Indian Tamil language period action-drama film ...
{{disambiguation