Question mark

The question mark is a piece of punctuation used by many languages on Earth, usually denoting an inquisitive sentence and, by itself, representing an unanswered, unasked question.

During his sixth and seventh incarnations, the Doctor adopted the question mark as something of a personal motif:


 * The sixth incarnation displayed it on the collar of his shirt.
 * The seventh incarnation wore a jumper covered with the symbol, carried an umbrella with a handle shaped like a question mark, carried a business card with a stylized question mark, and when asked to sign his name, did so with a question mark (DW: Remembrance of the Daleks).