Psi

Look up PSI, Psi, or psi in Wiktionary, the free dictionary.

Psi, PSI or Ψ may refer to:

Alphabetic letters

• Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet
• Psi (Cyrillic), letter of the early Cyrillic alphabet, adopted from Greek

Arts and entertainment

• "Psi" as an abbreviation for psionics

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
• PSI Records, 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

• 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
• Indonesian Solidarity Party (Partai Solidaritas Indonesia)
• Indonesian Socialist Party (Partai Sosialis Indonesia)
• Proliferation Security Initiative, against weapons technology transfer
• Public Sector Information, as in:
  • The 2003 EU Directive on the re-use of public sector information
  • The UK Office of Public Sector Information (OPSI), formerly HMSO
• United States Senate Homeland Security Permanent Subcommittee on Investigations

Other organizations

• Paul Scherrer Institute, research institute in Villigen, Switzerland
• Pechersk School International, Kyiv, Ukraine
• Physics Society of Iran
• Planetary Science Institute, Tucson, Arizona, US
• Poetry Slam, Inc., promoting poetry
• Policy Studies Institute, UK research organization
• Population Services International, 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, trades unions federation
• Statisticians 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, former US CDC influenza scale
• Photosystem I, protein complex involved in photosynthesis
• Pneumonia severity index
• 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 management

Economics

• PSI-20, Lisbon, Portugal stock market index
• Private sector involvement, in sovereign debt crisis resolution

Engineering

• "Yaw" angle, one of the Euler angles, denoted ψ in aerospace engineering
• Present serviceability index, a pavement performance indicator introduced by AASHTO

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
• Reciprocal Fibonacci constant
• Population Stability Index (Kullback–Leibler divergence#Symmetrised divergence)

Physics and chemistry

• Pound 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

• Psy (disambiguation)
• Ps1 (disambiguation)

This disambiguation page lists articles associated with the title Psi.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

This page was last edited on 19 March 2024, at 11:24