The upside-down question mark, also known as a reversed question mark or an inverted question mark, is a punctuation mark that is used in a variety of languages, including Spanish, Portuguese, and Turkish. It is typically used to indicate a rhetorical question, a question that is asked for effect rather than for an answer, or a question that is intended to be humorous. The upside-down question mark can also be used to indicate a question that is being asked indirectly or that is being asked in a tentative or uncertain manner.
The upside-down question mark is a useful tool for writers and speakers who want to add emphasis or nuance to their questions. It can also be used to create a sense of mystery or suspense. In some cases, the upside-down question mark can even be used to indicate sarcasm or irony.