38 omicron characters
Checked October 2026

Omicron Symbol Copy and Paste

Copy ο, the Greek letter omicron, or take the capital Ο, an accented omicron or a math style.

οGreek small letter omicronU+03BFReady to copy

38 omicron characters. Tap any value to copy it.

38 omicron characters. A character and its name both copy the character. A code copies the code.
Character	Name	Code point	Alt code	Option keys	HTML	LaTeX
	U+03BF. The fifteenth letter of the Greek alphabet and its short o: the name means small o, against omega, the great o. ο in HTML. It has no Alt code and no LaTeX macro of its own.
	U+039F. The capital. Ο in HTML. Most fonts draw it exactly like a Latin O, and it is a different character.
	U+03CC. Small omicron with the tonos, the one accent of modern Greek, which marks the stressed syllable.
	U+038C. Capital omicron with the tonos, for a stressed omicron at the start of a word.
	U+006F. The Latin small o, on every keyboard. It arose from omicron and looks the same, with a code point of its own.
	U+004F. The Latin capital O, on every keyboard: the twin of capital omicron, U+039F, in most fonts.
	U+0030. The digit zero, on every keyboard. It is hard to tell from a capital omicron.
	U+1D70A. Small omicron in italic, the slanted letter of a printed formula: U+03BF in a math font, by its Unicode definition.
	U+1F40. Small omicron with smooth breathing.
	U+1F41. Small omicron with rough breathing.
	U+1D6D0. Small omicron in upright bold: U+03BF in a math font, by its Unicode definition.
	U+1D744. Small omicron in bold italic: U+03BF in a math font, by its Unicode definition.
	U+1D77E. Small omicron in bold with no serifs: U+03BF in a math font, by its Unicode definition.
	U+1D7B8. Small omicron in bold italic with no serifs: U+03BF in a math font, by its Unicode definition.
	U+1D6B6. Capital omicron in upright bold: U+039F in a math font, by its Unicode definition.
	U+1D6F0. Capital omicron in italic, the slanted letter of a printed formula: U+039F in a math font, by its Unicode definition.
	U+1D72A. Capital omicron in bold italic: U+039F in a math font, by its Unicode definition.
	U+1D764. Capital omicron in bold with no serifs: U+039F in a math font, by its Unicode definition.
	U+1D79E. Capital omicron in bold italic with no serifs: U+039F in a math font, by its Unicode definition.
	U+1F42. Small omicron with smooth breathing and a grave accent.
	U+1F43. Small omicron with rough breathing and a grave accent.
	U+1F44. Small omicron with smooth breathing and an acute accent.
	U+1F45. Small omicron with rough breathing and an acute accent.
	U+1F48. Capital omicron with smooth breathing.
	U+1F49. Capital omicron with rough breathing.
	U+1F4A. Capital omicron with smooth breathing and a grave accent.
	U+1F4B. Capital omicron with rough breathing and a grave accent.
	U+1F4C. Capital omicron with smooth breathing and an acute accent.
	U+1F4D. Capital omicron with rough breathing and an acute accent.
	U+1F78. Small omicron with a grave accent.
	U+1F79. Small omicron with an acute accent. Unicode treats it as the same letter as U+03CC, the tonos form, and normalized text holds that one.
	U+1FF8. Capital omicron with a grave accent.
	U+1FF9. Capital omicron with an acute accent. Unicode treats it as the same letter as U+038C, the tonos form, and normalized text holds that one.
	U+2C9E. The Coptic letter in omicron's place, named o in Unicode. The Coptic alphabet descends from the Greek one and got code points of its own in Unicode 4.1 (2005).
	U+2C9F. Small o, the lowercase of the Coptic omicron.
	U+041E. The Cyrillic letter o, which arose from omicron. A third capital that looks like the Greek and the Latin one.
	U+043E. Small Cyrillic o, the lowercase of the pair, with its own code point too.
	U+00B0. The degree sign, a small raised ring, Alt+248 on a number pad. It is a sign and not a letter.

Next step ω and Ω, the great o

How it works

ο is the omicron symbol: Greek small letter omicron, U+03BF, the fifteenth letter of the Greek alphabet. The rows add the capital Ο, accented forms such as ό, math styles, and the Latin o and zero it is mistaken for.

Read the full guide

Greek has two letters for o

Omicron, ο, means small o and was the short vowel. Omega, ω, means great o and was the long one. Modern Greek says both the same way. The other letter has its own page.

ο, o and 0 are three characters

The Greek ο is U+03BF, the Latin o is U+006F and the digit zero is U+0030. Fonts draw the two letters alike, so a search for a Latin word misses text typed with the Greek letter.

LaTeX has no \omicron macro of its own, and no Alt code types omicron either.
In star names omicron marks the fifteenth star of a constellation, as in Omicron Ceti, the star Mira.

Questions and answers

How do I type omicron in HTML?

Write ο for the small letter and Ο for the capital. As numbers they are ο and Ο, or ο and Ο. The accented ό has no name of its own, so use ό.

Is omicron the same as the letter o?

No. Omicron is a Greek letter with its own code points, U+03BF and U+039F, where the Latin o and O are U+006F and U+004F. The Latin and the Cyrillic o both arose from omicron, which is why they look alike.

What does the omicron letter mean?

The name means small o. Omicron is the Greek alphabet's fifteenth letter and stands for 70 as a Greek numeral.

What do the accents on omicron mean?

ό carries the tonos, which marks the stressed syllable in modern Greek. Older spelling adds breathing marks, as in ὀ and ὁ, and grave and acute accents. Since 1982 standard Greek spelling needs only the tonos and the diaeresis.

All 38 omicron characters

Start here 10

Digit zero U+0030. The digit zero, on every keyboard. It is hard to tell from a capital omicron.
Greek capital letter omicron U+039F. The capital. Ο in HTML. Most fonts draw it exactly like a Latin O, and it is a different character.
Greek capital letter omicron with tonos U+038C. Capital omicron with the tonos, for a stressed omicron at the start of a word.
Greek small letter omicron U+03BF. The fifteenth letter of the Greek alphabet and its short o: the name means small o, against omega, the great o. ο in HTML. It has no Alt code and no LaTeX macro of its own.
Greek small letter omicron with dasia U+1F41. Small omicron with rough breathing.
Greek small letter omicron with psili U+1F40. Small omicron with smooth breathing.
Greek small letter omicron with tonos U+03CC. Small omicron with the tonos, the one accent of modern Greek, which marks the stressed syllable.
Latin capital letter O U+004F. The Latin capital O, on every keyboard: the twin of capital omicron, U+039F, in most fonts.
Latin small letter O U+006F. The Latin small o, on every keyboard. It arose from omicron and looks the same, with a code point of its own.
Mathematical italic small omicron U+1D70A. Small omicron in italic, the slanted letter of a printed formula: U+03BF in a math font, by its Unicode definition.

Show all 38 omicron characters (28 more)

Small omicron ο 4

Mathematical bold italic small omicron U+1D744. Small omicron in bold italic: U+03BF in a math font, by its Unicode definition.
Mathematical bold small omicron U+1D6D0. Small omicron in upright bold: U+03BF in a math font, by its Unicode definition.
Mathematical sans-serif bold italic small omicron U+1D7B8. Small omicron in bold italic with no serifs: U+03BF in a math font, by its Unicode definition.
Mathematical sans-serif bold small omicron U+1D77E. Small omicron in bold with no serifs: U+03BF in a math font, by its Unicode definition.

Capital omicron Ο 5

Mathematical bold capital omicron U+1D6B6. Capital omicron in upright bold: U+039F in a math font, by its Unicode definition.
Mathematical bold italic capital omicron U+1D72A. Capital omicron in bold italic: U+039F in a math font, by its Unicode definition.
Mathematical italic capital omicron U+1D6F0. Capital omicron in italic, the slanted letter of a printed formula: U+039F in a math font, by its Unicode definition.
Mathematical sans-serif bold capital omicron U+1D764. Capital omicron in bold with no serifs: U+039F in a math font, by its Unicode definition.
Mathematical sans-serif bold italic capital omicron U+1D79E. Capital omicron in bold italic with no serifs: U+039F in a math font, by its Unicode definition.

Accented omicron for Greek text 14

Greek capital letter omicron with dasia U+1F49. Capital omicron with rough breathing.
Greek capital letter omicron with dasia and oxia U+1F4D. Capital omicron with rough breathing and an acute accent.
Greek capital letter omicron with dasia and varia U+1F4B. Capital omicron with rough breathing and a grave accent.
Greek capital letter omicron with oxia U+1FF9. Capital omicron with an acute accent. Unicode treats it as the same letter as U+038C, the tonos form, and normalized text holds that one.
Greek capital letter omicron with psili U+1F48. Capital omicron with smooth breathing.
Greek capital letter omicron with psili and oxia U+1F4C. Capital omicron with smooth breathing and an acute accent.
Greek capital letter omicron with psili and varia U+1F4A. Capital omicron with smooth breathing and a grave accent.
Greek capital letter omicron with varia U+1FF8. Capital omicron with a grave accent.
Greek small letter omicron with dasia and oxia U+1F45. Small omicron with rough breathing and an acute accent.
Greek small letter omicron with dasia and varia U+1F43. Small omicron with rough breathing and a grave accent.
Greek small letter omicron with oxia U+1F79. Small omicron with an acute accent. Unicode treats it as the same letter as U+03CC, the tonos form, and normalized text holds that one.
Greek small letter omicron with psili and oxia U+1F44. Small omicron with smooth breathing and an acute accent.
Greek small letter omicron with psili and varia U+1F42. Small omicron with smooth breathing and a grave accent.
Greek small letter omicron with varia U+1F78. Small omicron with a grave accent.

Omicron in other alphabets 4

Coptic capital letter O U+2C9E. The Coptic letter in omicron's place, named o in Unicode. The Coptic alphabet descends from the Greek one and got code points of its own in Unicode 4.1 (2005).
Coptic small letter O U+2C9F. Small o, the lowercase of the Coptic omicron.
Cyrillic capital letter O U+041E. The Cyrillic letter o, which arose from omicron. A third capital that looks like the Greek and the Latin one.
Cyrillic small letter O U+043E. Small Cyrillic o, the lowercase of the pair, with its own code point too.

Look-alikes that are not omicron 1

Degree sign U+00B0. The degree sign, a small raised ring, Alt+248 on a number pad. It is a sign and not a letter.

How this list was compiled: Names, and the code points they belong to, are from UnicodeData.txt, version 18.0.0 (https://www.unicode.org/Public/18.0.0/ucd/UnicodeData.txt), printed in sentence case; its decomposition field is what says a math alphabet character is a plain letter in a font, or that an accented letter is a letter plus its marks. Aliases, notes and cross-references are from NamesList.txt of the same version (https://www.unicode.org/Public/18.0.0/ucd/NamesList.txt), the version a character was added in is from DerivedAge.txt (https://www.unicode.org/Public/18.0.0/ucd/DerivedAge.txt), and the years are from https://www.unicode.org/history/publicationdates.html. Alt codes are from the code page 437 table (https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT). HTML entity names are from https://html.spec.whatwg.org/entities.json, the shortest standard name first. LaTeX macros are listed only when LaTeX's own fontdef.dtx (https://github.com/latex3/latex2e/tree/develop/base) declares them, matched to a code point through unicode-math-table.tex (https://github.com/latex3/unicode-math). A cell is empty where no such method exists. What omicron is for, as https://en.wikipedia.org/wiki/Omicron records it: the fifteenth letter, the names small o and great o, the short vowel against the long one, the one sound of modern Greek, the numeral value 70, the fifteenth star of a constellation, the Latin and Cyrillic o that arose from it, and the Latin o and the zero it cannot be told from. The marks of Greek spelling: the tonos, the breathings, the accents, and the change of 1982: https://en.wikipedia.org/wiki/Greek_diacritics. The Coptic alphabet as a descendant of the Greek one, given code points of its own in Unicode 4.1: https://en.wikipedia.org/wiki/Greek_alphabet. Listed: every character Unicode names omicron: the two letters, the two with tonos, the sixteen of the Greek Extended block with breathing marks and accents, and the ten math alphabet forms; then the Coptic and Cyrillic letters and the four characters it is mistaken for. Left out: omega and its forms (the omega page has them), the other Greek letters, the circles and rings of the shapes pages, and every use of the name outside the alphabet. The Start here group, the made rows and the order are this site's own choice. All sources were read on 1 October 2026; Wikipedia text is CC BY-SA 4.0 and restated in this site's own words. Licence: own work (facts from the Unicode Character Database, Unicode License v3, and from Wikipedia, CC BY-SA 4.0, restated in this site's own words; aliases and notes marked as Unicode's are quoted from NamesList.txt, Copyright © 1991-2026 Unicode, Inc., https://www.unicode.org/license.txt)