interrogation point (?)
Definition - The name of the ? symbol when used to indicate a question.

Notes:
1. In most European languages, it is placed at the end of the sentence.
2. In Spanish, it is placed both before and after the question, in the former case inverted as in ¿Quien sabe?, who knows?
3. It is also sometimes placed before a word or phrase, to query its correctness, existence, etc.

Usage:

1. Use it to express editorial doubt (i.e. to show that there is either missing data or that you're not sure that the data is correct).

Bob Smith (1940?–2007)

2. Place question marks inside quotation marks or parentheses only when they are part of quoted or parenthetical matter.

Mason replied, “What is the truth of the matter?”
Have you seen Coppola's “The Conversation”?

3. Don't add additional punctuation marks after a question mark that is enclosed in quotation marks.

“Where are you going?” she asked. (good)
“Where are you going?,” she asked. (bad)

4. Don't put a comma after a question mark that is within quotation marks.

He said, "Are you going?", and then he left. (bad)
He said, "Are you going?" and then he left. (good)

5. Don't use it for indirect questions.

She asked where he went. (good)
She asked where he went? (bad)

6. You can use it mid-sentence to mark an interrogative phrase. In this case, it functions like a comma.

Where shall we go? and what shall we do?

Oxford English Dictionary -
The symbol's first citation is from 1598:
"Iterogatiuo punto, a point of interrogation."
(Florio,)



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