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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.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
Chi with dot above: Arvanitika letter for /xʲ/ [7] Ψ̌ψ̌: Psi with caron: Nonstandard letter for Cypriot Greek [9] and Pontic Greek [10] representing /pʃ/ Ώώ: Omega with acute: High pitch on short vowel or rising pitch on long vowel Ὼὼ: Omega with grave: Archaic letter indicating normal or low pitch ῶ: Omega with circumflex
The most common symbols for a wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively). Wave functions are complex-valued . For example, a wave function might assign a complex number to each point in a region of space.
In Plato's Timaeus, it is explained that the two bands that form the soul of the world cross each other like the letter Χ. Plato's analogy, along with several other examples of chi as a symbol occur in Thomas Browne's discourse The Garden of Cyrus (1658). Chi or X is often used to abbreviate the name Christ, as in the holiday Christmas .
Psi Chi (ΨΧ) is a college student honor society in psychology with international outreach founded in 1929 at the University of Kansas in the United States. [1] Psi Chi is one of the largest honor societies in the United States, with more than 1,160 chapters. Psi Chi has more than 800,000 members from chapters in the United States, Canada, and ...
The symbol ϵ (U+03F5) is designated specifically for the lunate form, used as a technical symbol. The symbol ϑ ("script theta") is a cursive form of theta (θ), frequent in handwriting, and used with a specialized meaning as a technical symbol. The symbol ϰ ("kappa symbol") is a cursive form of kappa (κ), used as a technical symbol.
All forms of the Greek alphabet were originally based on the shared inventory of the 22 symbols of the Phoenician alphabet, with the exception of the letter Samekh, whose Greek counterpart Xi (Ξ) was used only in a sub-group of Greek alphabets, and with the common addition of Upsilon (Υ) for the vowel /u, ū/.