Psi
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Look up psi or PSI in Wiktionary, the free dictionary. |
Psi may refer to:
[edit] As a word
- 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
[edit] As a Greek letter
- 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
[edit] In mathematics
- ψ is used to denote tangential angle of a curve.
- ψ can also denote the digamma function, the polygamma functions, the Chebyshev function, or the Dedekind psi function.
- ψ is often used to denote the stream function in two-dimensional flows.
[edit] As an abbreviation
[edit] PSI
In Computing:
- Program Specific Information, part of the MPEG transport stream protocol. Metadata for digital transmission
- PSI (computational chemistry) software
- Personal Software Inspector, a host-based software vulnerability scanner from Secunia
PSI can be an abbreviation for:
- Pandemic Severity Index by the US Centers for Disease Control and Prevention
- Partai Sosialis Indonesia ("Indonesian Socialist Party")
- Paranormal Site Investigators, an education and research charity in the UK
- Italian Socialist Party (Partito Socialista Italiano)
- Para-social identification
- 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
- Persian State of Iran
- Pitch Shifter Industries, an acronym used by the British band Pitchshifter
- Photosystem I, a protein complex involved in photosynthesis
- 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
- 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
- Process Safety Incident
- Professional Secretaries International
- Professional Skills Institute
- Professors for a Strong Israel
- Proliferation Security Initiative, an international effort originally put forward by the United States to interdict transfer of banned weapons and weapons technology.
- 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 (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
[edit] psi
- Pounds per square inch, a unit of pressure
[edit] pSi
[edit] 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
[edit] In music
[edit] In fiction
- In the Babylon 5 universe, Psi Corps is the ruling body of Earth's telepaths
- PSI is the ability used by characters from the EarthBound series
- Psi-Ops, a video game by Midway where characters use psychic powers.
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