The question mark (?; also known as an interrogation point, interrogation mark, question point, query or eroteme), is a punctuation mark that replaces the full stop (period) at the end of an interrogative sentence in English and many other languages. The question mark is not used for indirect questions. The question mark character is also often used in place of missing or unknown data.
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“Be a little careful about your library. Do you foresee what you will do with it? Very little to be sure. But the real question is, What it will do with you? You will come here and get books that will open your eyes, and your ears, and your curiosity, and turn you inside out or outside in.”
—Ralph Waldo Emerson (1803–1882)