- REDIRECT
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. It is rarely used in mathematics because it is indistinguishable from the
Latin letters
O, o and easily confused with the
digit 0. This letter is derived from the Phoenician letter
ayin . In
classical Greek, omicron represented the sound in contrast to
omega and
ου . In
modern Greek, omicron represents the sound . Letters that arose from omicron include Roman
O and Cyrillic
O.
