Script Capital F
HTML Entity Browser Test:

U+2131 is the Unicode hex value of the character Script Capital F, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

"Script Capital F" was previously named "SCRIPT F" in older versions of Unicode. In addition, U+2131 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+2131
Character Name SCRIPT CAPITAL F
Old Name SCRIPT F
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping <font> 0046
Mirrored N
Unicode Character Encodings
Script Capital F HTML Entity &#8497; (decimal entity), &#x2131; (hex entity)
Windows Key Code Alt 8497 or Alt +21311
Programming Source Code Encodings Python hex: u"\u2131", Hex for C++ and Java: "\u2131"
UTF-8 Hexadecimal Encoding 0xE284B1
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 8497) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +2131) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Script Capital F character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.