Esta página es sobre la letra griega ómicron. Para la letra del alfabeto latino representada con un glifo similar ver O. Ómicron, ὂμικρόν (Ο ο), es la decimoquinta letra del alfabeto griego, tiene un valor de 70 (οʹ) en el sistema de numeración griega y significa literalmente "o pequeña". La letra minúscula Ο es usada como símbolo para: \n* En teoría de la complejidad computacional, la tasa de crecimiento asintótico de una función según la notación de o mayúscula.

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Omicron (uppercase Ο, lowercase ο, literally "small o": Όμικρον, o mikron, micron meaning 'small' in contrast to omega) is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. This letter is derived from the Phoenician letter ayin . In classical Greek, omicron represented the sound [o] in contrast to omega [ɔː] and ου [oː]. In modern Greek, omicron represents the mid back rounded vowel /o/. Letters that arose from omicron include Roman O and Cyrillic O. The upper-case letter of omicron (O) was originally used in mathematics as a symbol for Big O notation (representing a function's asymptotic growth rate), but has fallen out of favor because omicron is indistinguishable from the Latin letter O and easily confused with the digit zero (0). Omicron is used to designate the fifteenth star in a constellation group, its ordinal placement a function of both magnitude and position. Such stars include Omicron Andromedae, Omicron Ceti, and Omicron Persei.

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