Cyrillic Capital Letter Yi
HTML Entity Browser Test:

U+0407 is the Unicode hex value of the character Cyrillic Capital Letter Yi, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

In addition, U+0407 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+0407
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping 0406 0308
Mirrored N
Lowercase Version U+0457
Unicode Character Encodings
Cyrillic Capital Letter Yi HTML Entity Ї (decimal entity), Ї (hex entity)
Windows Key Code Alt 1031 or Alt +04071
Programming Source Code Encodings Python hex: u"\u0407", Hex for C++ and Java: "\u0407"
UTF-8 Hexadecimal Encoding 0xD087
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 1031) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +0407) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Cyrillic Capital Letter Yi character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.