Psi
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Look up PSI, Psi, or psi in Wiktionary, the free dictionary. |
Psi or the initials PSI or Ψ may refer to:
Alphabetic letters
- Psi (letter) (Ψ, ψ), the 23rd letter of the Greek alphabet
- Psi (Cyrillic) (Ѱ, ѱ), letter of the early Cyrillic alphabet, adopted from Greek
Arts and entertainment
Comics
- Psi (comics), DC Comics character
- Psi Division, division in the Judge Dredd and 2000 AD series of comics
- Psi-Force, comic series
- Psi-Hawk, comic character
- Psi Lords, comic series
Music
- PSI (album), album by Pitchshifter (2002)
- Psi Com, 1980s rock band
- Psi Power, song by rock group Hawkwind (1978)
- PSI Records, music record label
- Phil Spector International, record label between 1970 and 1980
- Ψ CMX DVD, Finnish language video album by the band CMX
- Pitch Shifter Industries, acronym used by the British band Pitchshifter
Other uses in arts and entertainment
- Psi Corps, in the Babylon 5 fictional universe, the ruling body of Earth's telepaths
- Psi Factor: Chronicles of the Paranormal, Canadian television series
- Psi-Ops: The Mindgate Conspiracy, video game in which characters use psychic powers (2004)
- PSI, the psychic power used by some characters in the EarthBound series
Organizations
Government and politics
- Italian Socialist Party (Partito Socialista Italiano), socialist and later social-democratic political party in Italy
- Italian Socialist Party (2007), social-democratic political party in Italy
- Partai Sosialis Indonesia ("Indonesian Socialist Party")
- Proliferation Security Initiative, international initiative to interdict transnational transfer of banned weapons and weapons technology
- Public Sector Information, as in:
- The European Union Directive on the re-use of public sector information (PSI directive), adopted in November 2003
- The United Kingdom's Office of Public Sector Information (OPSI), formerly Her Majesty's Stationery Office (HMSO)
- United States Senate Homeland Security Permanent Subcommittee on Investigations, sub-committee of the U.S. Senate
Other organizations
- Paul Scherrer Institute, research institute in Villigen, Switzerland
- Pechersk School International, in Kiev, Ukraine
- Phi Sigma Iota, honor society
- Planetary Science Institute, research institute in Tucson, Arizona
- Poetry Slam, Inc.
- Policy Studies Institute, UK research organization
- Population Services International, nonprofit global health organization
- Professional Skills Institute, private university in Toledo, Ohio
- Professors for a Strong Israel, right-wing group of academics in Israel
- Prudential Securities Incorporated, financial services company
- Psychiatric Solutions, Inc., corporation that owns psychiatric hospitals
- Public Services International, global union federation of public sector trade unions
- Statisticians in the Pharmaceutical Industry, promotes use of statistics in the pharmaceutical industry
Parapsychology
- Psi (parapsychology), psychic or paranormal phenomena
- Psi hit, parapsychological experimentation term
- Paranormal Site Investigators, in the UK
Science, technology, and mathematics
Biology and medicine
- PSI (prion), infectious protein in yeast
- Pandemic severity index, used by the US Centers for Disease Control and Prevention
- Photosystem I, protein complex involved in photosynthesis
- Pneumonia severity index
- Protein Structure Initiative, structural genomics 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
Economics
- PSI-20, stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal
- Private sector involvement, in sovereign-debt restructuring deals
Engineering
- "Yaw" angle, one of the Euler angles, denoted ψ in aerospace engineering
Geography
- Psi Islands, in the Melchior Islands, Antarctica
Mathematics
- Chebyshev function
- Dedekind psi function
- Digamma function
- Polygamma functions
- Stream function, in two-dimensional flows
- Polar tangential angle of a curve
- Probability of ultimate ruin, in ruin theory
- Supergolden ratio
Physics and chemistry
- Pounds per square inch, unit of pressure
- PSI (computational chemistry), software
- J/psi meson, subatomic particle
- Porous silicon
- Water potential, denoted Ψ, in physical chemistry, the potential energy of a water solution relative to pure water
- Wave function, denoted ψ, in quantum mechanics
Psychology
- Psychology or psychologist, denoted Ψ, used in the logo of various psychological associations
- Psi Chi, the National Honor Society in psychology
- Psi-theory, 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, air pollution measure
- Pre-shipment inspection, method of quality control
- Presentence investigation report, investigation into the history of person convicted of a crime
See also
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