Ohm Sign
HTML Entity Browser Test:

U+2126 is the Unicode hex value of the character Ohm Sign, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

"Ohm Sign" was previously named "OHM" in older versions of Unicode. In addition, U+2126 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+2126
Character Name OHM SIGN
Old Name OHM
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping 03A9
Mirrored N
Lowercase Version U+03C9
Unicode Character Encodings
Ohm Sign HTML Entity Ω (decimal entity), Ω (hex entity)
Windows Key Code Alt 8486 or Alt +21261
Programming Source Code Encodings Python hex: u"\u2126", Hex for C++ and Java: "\u2126"
UTF-8 Hexadecimal Encoding 0xE284A6
1 To type a Unicode symbol in Windows, hold down the ALT key and enter the decimal or hexadecimal code provided using the numeric keypad. The decimal alt code (Alt 8486) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +2126) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Ohm Sign character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.