HTML Entity Browser Test:

U+001F is the Unicode hex value of the character <control>, which is categorized as "control character" in the Unicode 6.0 character table.

"<control>" was previously named "INFORMATION SEPARATOR ONE" in older versions of Unicode.

Unicode Character Information
Unicode Hex U+001F
Character Name <control>
General Category Control Character [Code: Cc]
Canonical Combining Class 0
Bidirectional Category S
Mirrored N
Unicode Character Encodings
<control> HTML Entity &#31; (decimal entity), &#x001F; (hex entity)
Windows Key Code Alt 0031 or Alt +001F1
Programming Source Code Encodings Python hex: u"\u001F", Hex for C++ and Java: "\u001F"
UTF-8 Hexadecimal Encoding 0x1F
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 0031) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +001F) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the <control> character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.