U+03B5 "ε" Greek Small Letter Epsilon Unicode Character

U+03B5 "ε" Greek Small Letter Epsilon is the fifth letter of the Greek alphabet, used extensively in mathematics, science, and linguistics. In mathematics, it commonly represents a small positive quantity in calculus and analysis, as well as denoting the Levi-Civita symbol in tensor calculus or the empty set in set theory when combined with other notation. In physics, epsilon often indicates permittivity or strain, while in linguistics it represents the mid front unrounded vowel sound. Originating from the Phoenician letter he, epsilon is distinct from the similar-looking Latin letter E and holds significant symbolic weight in academic and technical contexts across multiple disciplines.