Latin Capital Letter M With Dot Above
HTML Entity Browser Test:

U+1E40 is the Unicode hex value of the character Latin Capital Letter M With Dot Above, which is categorized as "uppercase letter" in the Unicode 6.0 character table.

In addition, U+1E40 is a composite character comprising of one or more other Unicode characters modified or combined.

Unicode Character Information
Unicode Hex U+1E40
General Category Uppercase Letter [Code: Lu]
Canonical Combining Class 0
Bidirectional Category L
Decomposition Mapping 004D 0307
Mirrored N
Lowercase Version U+1E41
Unicode Character Encodings
Latin Capital Letter M With Dot Above HTML Entity Ṁ (decimal entity), Ṁ (hex entity)
Windows Key Code Alt 7744 or Alt +1E401
Programming Source Code Encodings Python hex: u"\u1E40", Hex for C++ and Java: "\u1E40"
UTF-8 Hexadecimal Encoding 0xE1B980
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 7744) will only work on computers with support for this Unicode character in the active code page. The hexadecimal alt code (Alt +1E40) will work for all Unicode characters provided Hex input from the numeric keypad is enabled.
* If the Latin Capital Letter M With Dot Above character does not display correctly in your browser, you may not have a Unicode font on your system that supports this particular symbol.