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Epsilon (US: / ˈ ɛ p s ɪ l ɒ n /, [1] UK: / ɛ p ˈ s aɪ l ə n /; [2] uppercase Ε, lowercase ε or ϵ; Greek: έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a mid front unrounded vowel IPA: or IPA:.
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.
Greek symbols are used as symbols in mathematics, physics and other sciences. Many symbols have traditional uses, such as lower case epsilon (ε) for an arbitrarily small positive number , lower case pi (π) for the ratio of the circumference of a circle to its diameter , capital sigma (Σ) for summation , and lower case sigma (σ) for standard ...
Epsilon with grave and rough breathing: Archaic letter denoting the presence of /h/ prior to the vowel, with a normal or low pitch Ε̠ε̠: Epsilon with macron below: Arvanitika letter for /ə/ [7] Ζ̌ζ̌: Zeta with caron: Nonstandard letter for Cypriot Greek [9] and Pontic Greek [10] representing /ʒ/ Ζ̇ ζ̇: Zeta with dot above ...
Other names include the permutation symbol, antisymmetric symbol, or alternating symbol, which refer to its antisymmetric property and definition in terms of permutations. The standard letters to denote the Levi-Civita symbol are the Greek lower case epsilon ε or ϵ , or less commonly the Latin lower case e .
The normal letter epsilon (Ε) was used exclusively for the latter, while a new special symbol (or, in Sicyon, ) stood both for short /e/ and for /ɛː/. Yet another variation of the system is found in neighbouring Tiryns : it uses the letter forms of the Corinthian system, versus E, but with the functional values of the classic eta versus ...
greek beta symbol u+03d1: ϑ: greek theta symbol u+03d2: ϒ: greek upsilon with hook symbol u+03d5: ϕ: greek phi symbol u+03f0: ϰ: greek kappa symbol u+03f1: ϱ: greek rho symbol u+03f4: ϴ: greek capital theta symbol u+03f5: ϵ: greek lunate epsilon symbol u+03f6 ϶ greek reversed lunate epsilon symbol
While the tónos of monotonic orthography looks similar to the oxeîa of polytonic orthography in most typefaces, Unicode has historically separate symbols for letters with these diacritics. For example, the monotonic "Greek small letter alpha with tónos" is at U+03AC, while the polytonic "Greek small letter alpha with oxeîa" is at U+