Psi
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/* In mathematics */ Change link to tangential angle
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{{wiktionarypar|psi|PSI}}
'''Psi''' may refer to:
==As a word==
* [[Psi (letter)|Psi (Greek)]] (Ψ, ψ) a letter of the Greek alphabet
* [[Psi (Cyrillic)]] (Ѱ, ѱ), a letter of the early Cyrillic alphabet, adopted from Greek
* [[Psi (instant messaging client)]], a popular Jabber client program
* [[Psi (parapsychology)]]
* [[Psi-Theory]], a theory about the human mind, a cognitive architecture
* [[Psi hit]], a parapsychological experimentation term
* ''[[Psi Factor: Chronicles of the Paranormal]]'', a Canadian television series
==As a Greek letter==
* [[J particle|J/ψ particle]], a subatomic particle
* [[Wavefunction]] in Quantum Mechanics, ψ
* In physical chemistry, Ψ represents [[water potential]], the potential energy of a water solution relative to pure water
* Ψ stands for [[psychology]] and psychologist, often used in the logo of various psychological associations
* ΨΧ ([[Psi Chi]]), National Honor Society in Psychology
==In mathematics==
* ψ is used to denote [[tangential angle]] of a curve.
* ψ can also denote the [[digamma function]], the [[polygamma function]]s, or the [[Dedekind psi function]]
==As an abbreviation==
===PSI===
PSI can be an abbreviation for:
* [[Italian Socialist Party]] (''Partito Socialista Italiano'')
* [[Pandemic Severity Index]] by the US Centers for Disease Control and Prevention
* [[Paul Scherrer Institute]] in Villigen, Switzerland
* [[Pechersk School International]] in Kyiv, Ukraine
* [[Permanent Staff Instructor]] in the British Army
* [[Permanent Subcommittee on Investigations]] (PSI) of the US Senate
* [[Pneumonia severity index]]
* [[Pollutant Standards Index]], an air pollution index developed by the US Environmental Protection Agency
* [[Population Services International]], an international healthcare NGO based in Washington DC
* [[PSI-20|Portuguese Stock Index]] (PSI-20), a benchmark stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal
* [[Presentence Investigation]]
* [[Professional Secretaries International]]
* [[Professors for a Strong Israel]]
* [[Program Specific Information]], part of the MPEG transport stream protocol. Metadata for digital transmission
* [[Proliferation Security Initiative]]
* [[Protein Structure Initiative]], a structural genomics initiative of the U.S. NIGMS
* [[Public Services International]], a global union federation of public sector trade unions
* [[PSI (computational chemistry)]] software
* [[PSI (prion)]], an infectious protein in yeast
* [[PSI Records]], a record label
* [[Statisticians In The Pharmaceutical Industry]], the PSI acronym (rather than SPI) is chosen for its relation to the Greek letter Ψ, commonly used in statistical formulae
===psi===
* [[Pounds per square inch]], a unit of pressure
===pSi===
* [[Porous silicon]]
==In comics==
* [[Psi (comics)]], a character in DC Comics
* ''[[Psi-Force]]'', a comic series
* [[Psi-Hawk]], a comic character
* ''[[Psi Lords]]'', a comic series
* [[Psi Division]], a division in the Judge Dredd and 2000 AD series of comics
==In music==
* [[Psi Power]], a 1978 song by the UK rock group Hawkwind
* [[Psi Com]], a 1980s rock band
==In video games==
* In the [[EarthBound]] series, the main characters use psychic abilities known as PSI pronounced PK. Examples of these powers are PSI(PK) Fire and PSI(PK)Freeze.
==In fiction ==
* In [[Babylon 5]] universe, [[Psi Corps]] is the ruling body of Earth's telepaths
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