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Answer:

The question mark (?) is a punctuation symbol used to indicate a direct question at the end of a sentence or phrase. It is also known as an interrogation point, note of interrogation, or question point.

History: The origin of the question mark is uncertain, with various theories suggesting its creation. One theory links it to ancient Egyptians observing the shape of a cat’s tail. Another possibility connects it to the Latin word “quaestio,” which scholars in the Middle Ages used to signify questions. The symbol may have been introduced by Alcuin of York in the 8th or 9th century as a punctus interrogativus resembling a tilde or lightning flash.

Purpose: The primary purpose of the question mark is to denote a question or doubt. It always ends a direct question and signifies an interrogative expression aimed at testing knowledge or seeking information.

Correct and Incorrect Use:

• The question mark should be used at the end of direct questions.
• It can be used for multiple questions within a sentence.
• When using quotation marks, they should come before the question mark if not part of the quoted text.

Top 3 Authoritative Sources Used in Answering this Question:

1. Oxford Living Dictionaries: Provides insights into the history and origins of punctuation marks like the question mark.
2. Merriam-Webster’s Guide to Punctuation and Style: Offers guidance on punctuation rules and usage, including details on how to correctly use question marks.
3. Rene J. Cappon’s “The Associated Press Guide to Punctuation”: Contains valuable information on punctuation rules and best practices for using punctuation marks effectively.

These sources were instrumental in providing accurate information on the history, purpose, and correct usage of the question mark punctuation symbol.