Psi

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Psi

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Psi

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Psi

Psi (letter) (Ψ, ψ) of the Greek alphabet

Psi (Cyrillic) (Ѱ, ѱ), letter of the early Cyrillic alphabet, adopted from Greek

Psi (instant Messenger) , the popular Jabber client program

J/ψ Particle , a subatomic particle

Schrödinger Equation in quantum mechanics, ψ

Ψ in mathematics is the angle between the tangent and the x-axis in the Intrinsic Coordinates system

Psi denotes the unknown factor in Parapsychology , usually referring to psychic or Psionic powers

Psi, a character in the game and television series Pokémon

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

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