Question mark (?)
A question mark is used to indicate the end of a question:
Have you seen the film yet?
Note that you don’t use a question mark at the end of a question in reported speech:
He asked if I had seen the film yet.
A question mark can also be used in brackets to show that the writer is unconvinced by a statement:
I’m about to get started on the new project, which is apparently quite straightforward (?).