Deseret Capital Letter Em
HTML Entity Browser Test:

U+10423 is the Unicode hex value of the character Deseret Capital Letter Em, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

Unicode Character Information
Unicode Hex U+10423
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Mirrored N
Lowercase Version U+1044B
Unicode Character Encodings
Deseret Capital Letter Em HTML Entity 𐐣 (decimal entity), 𐐣 (hex entity)
Windows Key Code Alt 66595 or Alt +104231
Programming Source Code Encodings Python hex: u"\u10423", Hex for C++ and Java: "\u10423"
UTF-8 Hexadecimal Encoding 0xF09090A3
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 66595) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +10423) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Deseret Capital Letter Em character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.