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in group theory it is used as the idempotent group when e is in use as a variable name.in numerical analysis an statistics it is used as the error term.While in normal typography these are just alternative font variants, they may have different meanings as mathematical symbols: computer systems therefore offer distinct encodings for them.
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The other, also known as lunate or uncial epsilon and inherited from earlier uncial writing, looks like a semicircle crossed by a horizontal bar: it is encoded U+03F5 ϵ GREEK LUNATE EPSILON SYMBOL. One, the most common in modern typography and inherited from medieval minuscule, looks like a reversed number "3" and is encoded U+03B5 ε GREEK SMALL LETTER EPSILON. The lowercase version has two typographical variants, both inherited from medieval Greek handwriting.
#SIGMA SYMBOL IN WORD 2013 KEYBOARD CODE#
The uppercase form of epsilon looks identical to Latin E but has its own code point in Unicode: U+0395 Ε GREEK CAPITAL LETTER EPSILON. The name of the letter was originally εἶ ( Ancient Greek: ), but the name was changed to ἒ ψιλόν ( e psilon 'simple e') in the Middle Ages to distinguish the letter from the digraph αι, a former diphthong that had come to be pronounced the same as epsilon. Letters that arose from epsilon include the Roman E, Ë and Ɛ, and Cyrillic Е, È, Ё, Є and Э.
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It was derived from the Phoenician letter He. In the system of Greek numerals it also has the value five. Epsilon ( UK: / ɛ p ˈ s aɪ l ə n/, / ˈ ɛ p s ɪ l ɒ n/ US: / ˈ ɛ p s ɪ l ɒ n/ uppercase Ε, lowercase ε or lunate ϵ Greek: έψιλον) is the fifth letter of the Greek alphabet, corresponding phonetically to a mid front unrounded vowel /e/.