Arabic Hamza Above
HTML Entity Browser Test:

U+0654 is the Unicode hex value of the character Arabic Hamza Above, which is categorized as "non-spacing mark" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+0654
General Category Non-Spacing Mark [Code: Mn]
Canonical Combining Class 230
Bidirectional Category NSM
Mirrored N
Unicode Character Encodings
Arabic Hamza Above HTML Entity ٔ (decimal entity), ٔ (hex entity)
Windows Key Code Alt 1620 or Alt +06541
Programming Source Code Encodings Python hex: u"\u0654", Hex for C++ and Java: "\u0654"
UTF-8 Hexadecimal Encoding 0xD994
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 1620) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +0654) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Arabic Hamza Above character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.