ALT COMMANDS
Press and hold the ALT key, type 2 3 4 on the numeric keypad, then release the ALT key. The ALT code for the Latin small letter e with circumflex ê is 0234 on the Windows ALT Code Symbols page. Press and hold the ALT key, type 0 2 3 4 on the numeric keypad, then release the ALT key. Note that the leading zero makes a distinct difference:
Links:
https://altcodeunicode.com/how-to-use-alt-codes/