Mathematical Italic Capital S
HTML Entity Browser Test:
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U+1D446 is the Unicode hex value of the character Mathematical Italic Capital S, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

In addition, U+1D446 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+1D446
Character Name MATHEMATICAL ITALIC CAPITAL S
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping <font> 0053
Mirrored N
Unicode Character Encodings
Mathematical Italic Capital S HTML Entity &#119878; (decimal entity), &#x1D446; (hex entity)
Windows Key Code Alt 119878 or Alt +1D4461
Programming Source Code Encodings Python hex: u"\u1D446", Hex for C++ and Java: "\u1D446"
UTF-8 Hexadecimal Encoding 0xF09D9186
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 119878) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +1D446) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Mathematical Italic Capital S character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.