This article is about Greek upsilon. For Latin upsilon, see ʊ. "Ypsilon" redirects here. For the bridge in Drammen, Norway, see Ypsilon (bridge). For the car model, see Lancia Ypsilon. Look up Υ or υ in Wiktionary, the free dictionary. Greek alphabet Αα Alpha Νν Nu Ββ Beta Ξξ Xi Γγ Gamma Οο Omicron Δδ Delta Ππ Pi Εε Epsilon Ρρ Rho Ζζ Zeta Σσς Sigma Ηη Eta Ττ Tau Θθ Theta Υυ Upsilon Ιι Iota Φφ Phi Κκ Kappa Χχ Chi Λλ Lambda Ψψ Psi Μμ Mu Ωω Omega Other characters Digamma Qoppa San Sampi Stigma Sho Heta Tsan Greek diacritics

Upsilon (uppercase Υ, lowercase υ; Greek: Ύψιλον, Úpsilon) is the 20th letter of the Greek alphabet. In the system of Greek numerals it has a value of 400. It is derived from the Phoenician waw. The name of the letter is pronounced /ˈipsilon/ in Modern Greek, and in English /ˈʌpsɨlɒn/, UK: /juːpˈsaɪlən/, or US: /ˈjuːpsɨlɒn/. It is occasionally called "ypsilon" (/ˈɪpsɨlɒn/) in English after its rendering in Latin, where the Greek upsilon corresponded with the letter Y.

Contents 1 Pronunciation 2 Correspondence with Latin Y 3 Usage 4 Notes // Pronunciation

In early Greek and modern physics it is pronounced oo u . In Classical Greek, it was pronounced like French u or German ü, y—a sound that is not found in most dialects of English. This was the case at least until the year 1030AD.1 In Modern Greek it is pronounced like continental i or English ee, i, and in diphthongs, [f] or [v]. In ancient Greek it occurred in both long and short versions, but this distinction has been lost in Modern Greek.

As an initial letter in Classical Greek it always carried the rough breathing (equivalent to h) as reflected in the many Greek-derived English words, such as those that begin with hyper- and hypo-. This rough breathing was derived from an older pronunciation which used a sibilant instead; this sibilant was not lost in Latin, giving rise to such cognates as super- (for hyper-) and sub- (for hypo-).

Upsilon participated as the second element in falling diphthongs, which have subsequently developed in various ways: for instance after alpha or epsilon it is pronounced [f] or [v].

Correspondence with Latin Y

The usage of Y in Latin dates back to the first century BC. It was used to transcribe loanwords from Greek, so it was not a native sound of Latin and was usually pronounced /u/ or /i/. The latter pronunciation was the most common in the Classical period and was used by most people except the educated ones. The Roman Emperor Claudius proposed introducing a new letter into the Latin alphabet to transcribe the so-called sonus medius (a short vowel before labial consonants), but in inscriptions was sometimes used for Greek upsilon instead.

The name of the letter was originally just υ (y; also called hy, hence "hyoid", meaning "y-shaped"). It changed to υ ψιλόν, (u psilon, meaning 'simple u') to distinguish it from ου, which had come to have the same [y] pronunciation.2 Four letters of the Latin alphabet arose from it: V and Y and, much later, U and W. In the Cyrillic alphabet, the letters U (У, у) and Izhitsa (Ѵ, ѵ) arose from it.

In some languages (most notably German), the name upsilon, (üppsilon) is used to refer to the Latin letter Y as well as the Greek letter.

Usage In particle physics the capital Greek letter Υ denotes an Upsilon particle. Note that the symbol should always look like in order to avoid confusion with a Latin Y denoting the hypercharge. Automobile manufacturer Lancia has a model called the Ypsilon. See Lancia Ypsilon. In linguistics, the symbol is used to represent a labiodental approximant. Notes ^ F. Lauritzen, Michael the Grammarian's irony about Hypsilon. A step towards roeconstructing byzantine pronunciation Byzantinoslavica, 67 (2009) ^ See W. Sidney Allen, Vox Graeca, 3rd ed., Cambridge 1987, p. 69.
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