The upside-down question mark, also known as the inverted question mark, is a punctuation mark used in Spanish to indicate a question. It is written as an upside-down question mark () and is placed at the beginning of a question. For example: Cmo ests? (How are you?).
The upside-down question mark is used in all types of Spanish questions, including yes/no questions, wh-questions, and rhetorical questions. It is also used in indirect questions. For example: Me pregunt si quera ir al cine. (He asked me if I wanted to go to the movies.).