Alt-U: Unicode Entry
Enter a Unicode character as a series of hexadecimal digits. To exit this mode, type any printable character other than a hex digit, or press Esc or End.
Characters outside the BMP are supported. For example, you can type Alt-U 1 F 4 3 1 to produce a cat face emoji.
Alt-U is the default hotkey for this action, but you can change it with
EDITKEYS /K7:
key.