A family of Microsoft word processing software products for creating web, email, and print documents.
On the Insert tab of the ribbon, in the Symbols group, click Symbol > More Symbols...
Make sure that Font is set to (normal text)
Scroll down a bit. You'll find the inverted exclamation mark a few characters after lower case z.
Select it, then click Insert.
Alternatively, type A1 and then press Alt+X.
Or type Alt+0161 using the number keys on the numeric keypad while NumLock is on.