Cyrillic Capital Letter Closed Little Yus
HTML Entity Browser Test:

U+A658 is the Unicode hex value of the character Cyrillic Capital Letter Closed Little Yus, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+A658
Character Name CYRILLIC CAPITAL LETTER CLOSED LITTLE YUS
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Mirrored N
Lowercase Version U+A659
Unicode Character Encodings
Cyrillic Capital Letter Closed Little Yus HTML Entity Ꙙ (decimal entity), Ꙙ (hex entity)
Windows Key Code Alt 42584 or Alt +A6581
Programming Source Code Encodings Python hex: u"\uA658", Hex for C++ and Java: "\uA658"
UTF-8 Hexadecimal Encoding 0xEA9998
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 42584) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +A658) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Cyrillic Capital Letter Closed Little Yus character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.