Psi
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(Redirected from PSI)
Psi has multiple meanings:
- Psi (letter) (Ψ, ψ) of the Greek alphabet
- Psi (Cyrillic) (Ѱ, ѱ), letter of the early Cyrillic alphabet, adopted from Greek
- Psi (parapsychology)
- Psi (instant messaging client), a popular Jabber client program
- J/ψ particle, a subatomic particle
- Schrödinger equation in quantum mechanics, ψ
- In mathematics, Ψ is used to denote the angle between the tangent and the x-axis in the intrinsic coordinates system
- Again in mathematics, Ψ is also used to denote the Digamma and Polygamma functions.
- PSI (prion), a infectious protein in yeast
- Psi, is a common shortening of the word psychic
- Psi (comics), a DC Comics character
A homophone of Psi is Sai, which is an Asian weapon shaped (probably coincidently) like the Greek letter Psi.
PSI stands for:
- pound-force per square inch (psi), a non-SI unit of pressure
- PSI (computational chemistry) software
- Italian Socialist Party (Partito Socialista Italiano)
- Paul Scherrer Institute in Villigen, Switzerland
- Permanent Staff Instructor in the British Army
- Permanent Subcommittee on Investigations (PSI) of the U.S. Senate
- Pollutant Standards Index, an air pollution index developed by the United States Environmental Protection Agency (USEPA)
- Population Services International, an international healthcare NGO based in Washington D.C.
- Professional Secretaries International
- Professors for a Strong Israel
- Program Specific Information, metadata for digital transmission
- Proliferation Security Initiative
- Public Services International, a global union federation of public sector trade unions
- Socialist Party of the Islands (Partit Socialista de les Illes)
- People with Speech Impairment
- Pechersk School International, a school in Kiev
- Protein Synthesis Inhibition
- Printing Souvenirs Inclusive, a Chicago souvenirs distributor
- Postpartum Support International, 501(c)3 organization devoted to women's mental health issues
pSi stands for:
de:Psi (Begriffsklärung) es:Psi eo:PSI fr:Psi ko:PSI it:PSI nl:Psi ja:PSI pl:Psi pt:Psi ru:Psi (значения) sl:Psi sv:Psi (olika betydelser)
