Go to OSX Daily to read How to Type Upside-Down Exclamation Point on Mac ¡!
“¡I need to type an inverted exclamation point!” the Mac user said… Indeed, the upside-down exclamation point ¡ is frequently used in Spanish and some other languages and thus it makes sense why you’d need to type the character, but if you’re using an English keyboard you may be wondering how you can type the upside down exclamation point character.
Fortunately the Mac makes this super simple. Typing the inverted exclamation point, or sometimes called the inverted bang, upside-down bang, or upside-down exclamation mark, is as easy as it gets
Read more: How to Type Upside-Down Exclamation Point on Mac ¡!