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Epsilon (uppercase/lowercase Ε ε), is the letter of the Greek alphabet, used to represent the "e" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 5. Letters that came from it include the Roman E and Cyrillic Е. It is also used in calculus to represent a very small number. In set theory it can be used to represent the statement "x is a member of y." (A little 'know': The Ypsilon is the only letter of the alphabet that you can divide into syllables: Y-psi-lon)