Cyrillic Capital Letter I With Diaeresis
HTML Entity Browser Test:

U+04E4 is the Unicode hex value of the character Cyrillic Capital Letter I With Diaeresis, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

In addition, U+04E4 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+04E4
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping 0418 0308
Mirrored N
Lowercase Version U+04E5
Unicode Character Encodings
Cyrillic Capital Letter I With Diaeresis HTML Entity Ӥ (decimal entity), Ӥ (hex entity)
Windows Key Code Alt 1252 or Alt +04E41
Programming Source Code Encodings Python hex: u"\u04E4", Hex for C++ and Java: "\u04E4"
UTF-8 Hexadecimal Encoding 0xD3A4
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 1252) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +04E4) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Cyrillic Capital Letter I With Diaeresis character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.