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The name of the letter was originally just "υ" (y; also called hy, hence "hyoid", meaning "shaped like the letter υ"), but the name changed to "υ ψιλόν" u psilon 'plain υ' to distinguish it from οι, which had come to have the same [y] pronunciation.
the Christoffel symbols that describe components of a metric connection; the stack alphabet in the formal definition of a pushdown automaton, or the tape-alphabet in the formal definition of a Turing machine; the Feferman–Schütte ordinal Γ 0; represents: the specific weight of substances; the lower incomplete gamma function
Shapes of horseshoe as designed for the African reference alphabet, clearly based on a serifed shape of the Latin capital U.. The letter Ʊ (minuscule: ʊ), called horseshoe or sometimes bucket, inverted omega or Latin upsilon, is a letter of the International Phonetic Alphabet used to transcribe a near-close near-back rounded vowel.
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.
Upsilon (Υ or υ) is the 20th letter of the Greek alphabet. Upsilon may also refer to: Latin upsilon (Ʊ or ʊ), a Latin letter; Lake Upsilon; Upsilon meson (ϒ)
Like Greek upsilon, it can be pronounced as /i/ (like и), or as /v/ (like в). The basic distinction rule is simple: izhitsa with stress and/or aspiration marks is a vowel and therefore pronounced /i/; izhitsa without diacritical marks is a consonant and pronounced /v/.
A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...
The lower-case letter ν is used as a symbol in many academic fields. Uppercase nu is not used, because it appears identical to Latin N. Mathematics: Degrees of freedom in statistics. The greatest fixed point of a function, as commonly used in the μ-calculus. Free names of a process, as used in the π-calculus.