question mark

 

noun

  • a punctuation mark (?) indicating a question.
  • used to express doubt or uncertainty about something: there’s a question mark over his future

Grammar

This punctuation mark is used to mark the end of a question. It can also be used to indicate that the writer believes that a statement is doubtful or questionable: Who is Sylvia? All was going well until a passing lad with a sense of fun (?) pulled out the plug.