An upside-down question mark on a Mac, also known as an inverted question mark or an upside-down question mark, is a punctuation mark that is used to indicate a question. It is typically used in Spanish and other languages that use the inverted question mark. On a Mac, you can create an upside-down question mark by pressing the Option key and the ? key at the same time.
The upside-down question mark is important because it allows you to type questions in Spanish and other languages that use the inverted question mark. It is also useful for typing mathematical expressions, as the upside-down question mark can be used to represent the less than or equal to symbol ().