Fullwidth Digit Eight
HTML Entity Browser Test:

U+FF18 is the Unicode hex value of the character Fullwidth Digit Eight, which is categorized as "decimal digit number" in the Unicode 6.0 character table.

In addition, U+FF18 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+FF18
General Category Decimal Digit Number [Code: Nd]
Canonical Combining Class 0
Bidirectional Category EN
Decomposition Mapping <wide> 0038
Numeric Value 8
Mirrored N
Unicode Character Encodings
Fullwidth Digit Eight HTML Entity &#65304; (decimal entity), &#xFF18; (hex entity)
Windows Key Code Alt 65304 or Alt +FF181
Programming Source Code Encodings Python hex: u"\uFF18", Hex for C++ and Java: "\uFF18"
UTF-8 Hexadecimal Encoding 0xEFBC98
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 65304) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +FF18) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Fullwidth Digit Eight character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.