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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“So is the English Parliament provincial. Mere country bumpkins, they betray themselves, when any more important question arises for them to settle, the Irish question, for instance,the English question why did I not say? Their natures are subdued to what they work in. Their good breeding respects only secondary objects.”
—Henry David Thoreau (18171862)
“And as he sowed, some seed fell on the path, and the birds came and ate it up.”
—Bible: New Testament, Mark 4:4.