Cyrillic Capital Letter Komi Zje
HTML Entity Browser Test:

U+0504 is the Unicode hex value of the character Cyrillic Capital Letter Komi Zje, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+0504
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Mirrored N
Lowercase Version U+0505
Unicode Character Encodings
Cyrillic Capital Letter Komi Zje HTML Entity Ԅ (decimal entity), Ԅ (hex entity)
Windows Key Code Alt 1284 or Alt +05041
Programming Source Code Encodings Python hex: u"\u0504", Hex for C++ and Java: "\u0504"
UTF-8 Hexadecimal Encoding 0xD484
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 1284) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +0504) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Cyrillic Capital Letter Komi Zje character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.