Cyrillic Capital Letter Barred O
HTML Entity Browser Test:

U+04E8 is the Unicode hex value of the character Cyrillic Capital Letter Barred O, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+04E8
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Mirrored N
Lowercase Version U+04E9
Unicode Character Encodings
Cyrillic Capital Letter Barred O HTML Entity Ө (decimal entity), Ө (hex entity)
Windows Key Code Alt 1256 or Alt +04E81
Programming Source Code Encodings Python hex: u"\u04E8", Hex for C++ and Java: "\u04E8"
UTF-8 Hexadecimal Encoding 0xD3A8
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 1256) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +04E8) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Cyrillic Capital Letter Barred O character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.