![]() In Biblical studies, as an abbreviation for the book of Psalms.The ordinal collapsing function and notation developed by Wilfried Buchholz.In building, to represent an adjustment to a U-value, accounting for thermal bridge effects.In circadian physiology, ψ represents the phase relationship between a zeitgeber and a biological rhythm. ![]() The letter psi is commonly used in physics to represent wave functions in quantum mechanics, such as in the Schrödinger equation and bra–ket notation: The classical Greek letter was adopted into the early Cyrillic alphabet as " Ѱ". However, it was abandoned after his death. Psi, or its Arcadian variant or was adopted in the Latin alphabet in the form of “Antisigma” (Ↄ, ↃC, or) during the reign of Emperor Claudius as one of the three Claudian letters. The Western letter (expressing pronounced as //kʰ//, later pronounced as //x//) was adopted into the Old Italic alphabets, and its shape is also continued into the Algiz rune of the Elder Futhark. In writing, the early letter appears in an angular shape ( ).There were early graphical variants that omitted the stem ("chickenfoot-shaped psi" as: or ). It appears in the 7th century BC, expressing pronounced as //ps// in the Eastern alphabets, but pronounced as //kʰ// in the Western alphabets (the sound expressed by Χ in the Eastern alphabets). There are several psi-like symbols such as (*28), (*24) and (*27) in the Linear B script, which suggests a pre-Phonecian origin of the character. It may or may not derive from the Phoenician alphabet. In both Classical and Modern Greek, the letter indicates the combination pronounced as //ps// (as in English word "lapse").įor Greek loanwords in Latin and modern languages with Latin alphabets, psi is usually transliterated as "ps". Psi (uppercase Greek, Modern (1453-) : Ψ, lowercase Greek, Modern (1453-) : ψ psi in Greek, Modern (1453-) pronounced as /ˈpsi/) is the 23rd letter of the Greek alphabet and is associated with a numeric value of 700.
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