Omicron

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Omicron

Omicron (uppercase ?, lowercase ?, literally "small o" : ?µ?????, o mikron, micron meaning 'small' in contrast to omega
Omega

Omega is the 24th and last letter of the Greek alphabet. In the Greek numerals it has a value of 800. The word literally means "great O" , as opposed to Omicron, which means "little O" ....
) is the 15th letter of the Greek alphabet

Greek alphabet

The Greek alphabet is a set of twenty-four letters that has been used to write the Greek language since the late 9th century BC or early 8th century BCE....
. In the system of Greek numerals

Greek numerals

Greek numerals are a numeral system using letters of the Greek alphabet. They are also known by the names Milesian numerals, Alexandrian numerals, or alphabetic numerals....
it has a value of 70. It is rarely used in mathematics because it is indistinguishable from the Latin

Latin alphabet

The Latin alphabet, also called the Roman alphabet, is the most widely used alphabetic writing system in the world today. It evolved from the western variety of the Greek alphabet called the Cumae alphabet, and was initially developed by the Ancient Romes to write the Latin....
letter O

O is the fifteenth letter of the modern Latin alphabet. Its name in English language is spelled o , plural oes ....
and easily confused with the digit

Numerical digit

In mathematics and computer science, a digit is a symbol used in numerals , to represent numbers, in Positional notation numeral systems. The name "digit" comes from the fact that the 10 digits of the hands correspond to the 10 symbols of the common base 10 number system, i.e....
0

0 (number)

0 is both a number and the numerical digit used to represent that number in numeral system. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures....
. This letter is equal to the Phoenician letter Ayin.

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Encyclopedia

Greek alphabet

The Greek alphabet is a set of twenty-four letters that has been used to write the Greek language since the late 9th century BC or early 8th century BCE....
. In the system of Greek numerals

Greek numerals

Latin alphabet

O is the fifteenth letter of the modern Latin alphabet. Its name in English language is spelled o , plural oes ....
and easily confused with the digit

Numerical digit

0 (number)

Modern Greek

Modern Greek refers the varieties of Greek spoken in the modern era. The beginning of the "modern" period of the language is often symbolically assigned to the fall of the Byzantine Empire in 1453, even though that date marks no clear linguistic boundary and many characteristic modern features of the language had been present centuries earli...
, Omicron represents the sound . Letters that arose from omicron include Roman O

O is the fifteenth letter of the modern Latin alphabet. Its name in English language is spelled o , plural oes ....
and Cyrillic O

O (Cyrillic)

O is a letter of the Cyrillic alphabet, representing the vowel word-initially and after hard consonants. In Russian language it may represent the sounds in unstressed positions, due to the phenomenon of akanye....
.

In Unicode

Unicode

Unicode is a computing industry standard allowing computers to consistently represent and manipulate Character expressed in most of the world's writing systems....
the capital letter is codepoint U+039F and the lowercase is U+03BF.

The upper-case letter of omicron (O) was originally used as a symbol for Big O notation

Big O notation

In mathematics, big O notation describes the asymptotic analysis of a function when the argument tends towards a particular value or infinity, usually in terms of simpler functions....
, representing the asymptotic rate of growth of a function in mathematics.