Look up PSI, Psi, or psi in Wiktionary, the free dictionary. Psi, PSI or Ψ may refer to: Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet...

Psi Psi Psi (ΨΨΨ), also known as Tri Psi, is a North American sorority for the mothers of members of the collegiate sorority Delta Delta Delta. Tri Psi...

Psi /ˈ(p)saɪ, ˈ(p)siː/ (P)SY, (P)SEE (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi [ˈpsi]) is the twenty-third and penultimate letter of the Greek alphabet...

Omega Psi Phi Fraternity, Inc. (ΩΨΦ) is a historically African-American fraternity. The fraternity was founded on November 17, 1911, the first at a historically...

The pound per square inch (abbreviation: psi) or, more accurately, pound-force per square inch (symbol: lbf/in2), is a unit of measurement of pressure...

Kappa Alpha Psi Fraternity, Inc. (ΚΑΨ) is a historically African American fraternity. Since the fraternity's founding on January 5, 1911, at Indiana University...

Phi Kappa Psi (ΦΚΨ), commonly known as Phi Psi, is an American collegiate social fraternity that was founded at Jefferson College in Canonsburg, Pennsylvania...

Psi function can refer, in mathematics, to the ordinal collapsing function ψ ( α ) {\displaystyle \psi (\alpha )} the Dedekind psi function ψ ( n ) {\displaystyle...

Psi Upsilon (ΨΥ), commonly known as Psi U, is a North American fraternity, founded at Union College on November 24, 1833. The fraternity reports 50 chapters...

Chi Psi (ΧΨ) is a fraternity consisting of active chapters at 34 American colleges and universities. Chi Psi was founded in 1841 at Union College in Schenectady...