Omega Symbol

Click to copy Ω (U+03A9) or ω (U+03C9). Type Ω with Alt+234 on Windows or Option+Z on a Mac, use Ω or \Omega in HTML and LaTeX, and paste text into the checker to swap the legacy ohm sign (U+2126) for the standard omega.

Use the Omega Symbol

Omega Symbol

Click the symbol to copy it

Formats

Character Ω
Unicode U+03A9
HTML entity Ω
HTML decimal Ω
HTML hexadecimal Ω
LaTeX \Omega
JS / JSON escape \u03A9
CSS content \3A9
UTF-8 bytes CE A9
URL-encoded %CE%A9
Excel / Sheets =UNICHAR(937)
Windows keys Alt+234

Click any row to copy that exact string.

Common Uses

Field Example Meaning
Electronics Electrical resistance in ohms, the SI unit named after Georg Ohm.
Physics Angular frequency, in radians per second.
Geometry Solid angle in steradians, such as a full sphere seen from its center.
Statistics The set of all possible outcomes of a random experiment.
Symbolism The first and last Greek letters, used to mean the beginning and the end.

Omega versus the legacy ohm sign

These may look identical, but they begin as different Unicode code points. Unicode canonical normalization maps the legacy OHM SIGN to capital omega, so U+03A9 is the interoperable choice for new text.

Build a resistance label

Enter a number and an SI prefix to build a ready-to-paste resistance value, like 4.7 kΩ on a schematic. SI style puts a space between the number and the unit.

220 Ω

Keyboard input methods

Platform Shortcut
macOS Option+Z types uppercase Ω on a US keyboard layout. For lowercase ω, open Character Viewer (Control+Command+Space) and search "omega".
Windows (Word/Office) Type 03A9 (or 03C9 for lowercase), then press Alt+X to convert the code into the symbol.
Windows (any app) Open Character Map (charmap.exe), search "omega", then copy and paste.
Windows Alt code Hold Alt and type 234 on the numeric keypad (Num Lock on) for Ω. There is no classic Alt code for ω.
Windows 10/11 emoji panel Press Windows key + period, open the Symbols section (the Ω icon) and scroll to the Greek letters.
Linux (IBus) Press Ctrl+Shift+U, type 3a9 (or 3c9 for lowercase), then press Enter or Space.
iPhone / Android Add the Greek keyboard in settings; ω is on the V key and Shift gives Ω. Or copy it from this page.
Google Docs Insert > Special characters, then search "omega".
Excel / Google Sheets =UNICHAR(937) gives Ω and =UNICHAR(969) gives ω.
LaTeX \Omega and \omega in math mode; \textohm (textcomp) or \ohm (siunitx) for the unit; \mho (amssymb) for ℧.

Omega checker

Paste text to see which omega-like characters it contains. The fix button applies Unicode NFC normalization, which turns the legacy ohm sign U+2126 into U+03A9 (it also merges any decomposed accents, a change you cannot see).

Nothing to check yet.

    Omega look-alikes and related characters

    Char Code point Name Use / note
    U+03A9 GREEK CAPITAL LETTER OMEGA Standard Ω and the ohm unit. HTML Ω or Ω, LaTeX \Omega.
    U+03C9 GREEK SMALL LETTER OMEGA Angular frequency ω. HTML ω, LaTeX \omega.
    U+2126 OHM SIGN Legacy compatibility character; NFC turns it into U+03A9.
    U+2127 INVERTED OHM SIGN The mho, old unit of conductance (1 mho = 1 siemens). HTML ℧, LaTeX \mho.
    U+038F GREEK CAPITAL LETTER OMEGA WITH TONOS Accented capital used in Modern Greek text.
    U+03CE GREEK SMALL LETTER OMEGA WITH TONOS Accented small omega in Modern Greek, as in ώρα.
    U+1D6C0 MATHEMATICAL BOLD CAPITAL OMEGA Styled math letter; NFKC folds it to Ω. Prefer \mathbf in LaTeX.
    U+1D714 MATHEMATICAL ITALIC SMALL OMEGA Styled math letter; NFKC folds it to ω.
    U+0460 CYRILLIC CAPITAL LETTER OMEGA Old Cyrillic letter, not a Greek omega.
    U+0277 LATIN SMALL LETTER CLOSED OMEGA Obsolete phonetic symbol, not for math.
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    Summary

    Click to copy Ω (U+03A9) or ω (U+03C9). Type Ω with Alt+234 on Windows or Option+Z on a Mac, use Ω or \Omega in HTML and LaTeX, and paste text into the checker to swap the legacy ohm sign (U+2126) for the standard omega.

    How it works

    1. Click the large omega symbol to copy it to your clipboard.
    2. Switch between uppercase (Ω) and lowercase (ω) with the toggle.
    3. Click any row in the formats list to copy that exact string: Unicode, HTML entity, or LaTeX.
    4. Check the keyboard section for a shortcut on your operating system: Alt+234 on Windows, Option+Z on a Mac.
    5. Paste text into the omega checker to see which omega-like characters it contains and replace the legacy ohm sign (U+2126) with U+03A9.
    6. Use the look-alike table to pick the right character: Greek omega, ohm sign, ℧ mho, accented or math-styled omega.

    Use cases

    • Label electrical resistance in ohms, such as 4.7 kΩ on a schematic or datasheet.
    • Write angular frequency in a physics formula, such as ω = 2πf.
    • Reference a solid angle in steradians, such as Ω = 4π for a full sphere.
    • Mark a sample space in probability and statistics notation.
    • Type Greek letters in an engineering or lab report without a special keyboard layout.
    • Copy the correct LaTeX command (\Omega or \omega) for a paper instead of typing it from memory.
    • Insert the "last" or "final" symbolism of omega into a title or design, as in Alpha and Omega.

    Frequently Asked Questions

    Last updated: 2026-10-10 · Reviewed by Nham Vu