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The Greek alphabet on a black-figure pottery vessel, with an archaic chickenfoot-shaped psi.. Psi / ˈ (p) s aɪ, ˈ (p) s iː / (P)SY, (P)SEE [1] (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700.
The OpenType font format has the feature tag "mgrk" ("Mathematical Greek") to identify a glyph as representing a Greek letter to be used in mathematical (as opposed to Greek language) contexts. The table below shows a comparison of Greek letters rendered in TeX and HTML. The font used in the TeX rendering is an italic style.
Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet; Psi (Cyrillic), letter of the early Cyrillic alphabet, adopted from Greek; Arts and entertainment
Greek characters. Symbol Name Meaning SI unit of measure ... psi: wave function: m −3/2
The latter will sparsely be used here, it is only needed to obtain a precise definition of what it means for a subset of a function space to be closed. It will be concluded below that the function space of wave functions is a Hilbert space. This observation is the foundation of the predominant mathematical formulation of quantum mechanics.
Greek also introduced three new consonant letters for its aspirated plosive sounds and consonant clusters: Φ for /pʰ/, Χ for /kʰ/ and Ψ for /ps/. In western Greek variants, Χ was instead used for /ks/ and Ψ for /kʰ/. The origin of these letters is a matter of some debate.
A history of ancient Greek: from the beginnings to late antiquity. Cambridge. pp. 266– 276. Revised and expanded translation of the Greek edition. (Christidis is the editor of the translation, not the 2001 original.) Wachter, R. (1998). "Eine Weihung an Athena von Assesos 1657". Epigraphica Anatolica. 30: 1. Willi, Andreas (2008).
Psi (Ѱ, ѱ; italics: Ѱ ѱ) is a letter in the early Cyrillic alphabet, derived from the Greek letter of the same name (Ψ, ψ). It represents the sound /ps/, as in English naps .