U+2126 "Ω" Ohm Sign Unicode Character
Unicode Version 17.0
Ω
U+2126 "Ω" Ohm Sign is a typographic symbol representing the ohm, the SI unit of electrical resistance, and is visually identical to the Greek capital letter omega. It was included in Unicode for compatibility with legacy character sets and standards, but its use is deprecated in favor of the standard Greek letter omega U+03A9, which is preferred for modern text encoding. Because the two characters are canonically equivalent, U+2126 exists primarily for round-trip conversion with older systems and should generally be avoided in new writing.
General Properties
| Code Point | U+2126 |
| Version Added | 1.1 |
| Name | Ohm Sign |
| Unicode 1.0 Name | Ohm |
| Block | Letterlike Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "Ω" U+03A9 Greek Capital Letter Omega |
Encodings
| HTML Decimal Encoding | Ω |
| HTML Hex Encoding | Ω |
| UTF-8 Encoding | 0xE2 0x84 0xA6 |
| UTF-16 Encoding | 0x2126 |
| UTF-32 Encoding | 0x00002126 |
| C/C++/Java Escape | \u2126 |
Unicode Properties
| Full Composition Exclusion | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| East Asian Width | Ambiguous |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ω" U+03C9 Greek Small Letter Omega |
| Lowercase Code Point | "ω" U+03C9 Greek Small Letter Omega |
| Simple Case Folding | "ω" U+03C9 Greek Small Letter Omega |
| Case Folding | "ω" U+03C9 Greek Small Letter Omega |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ω" U+03C9 Greek Small Letter Omega |
| NFKC Simple Casefold | "ω" U+03C9 Greek Small Letter Omega |
| Script | Greek |
| Script Extensions | Greek |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |