Latin Capital Letter S
HTML Entity Browser Test:

U+0053 is the Unicode hex value of the character Latin Capital Letter S, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+0053
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Mirrored N
Lowercase Version U+0073
Unicode Character Encodings
Latin Capital Letter S HTML Entity S (decimal entity), S (hex entity)
Windows Key Code Alt 0083 or Alt +00531
Programming Source Code Encodings Python hex: u"\u0053", Hex for C++ and Java: "\u0053"
UTF-8 Hexadecimal Encoding 0x53
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 0083) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +0053) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Latin Capital Letter S character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.