A stigma of shame

(engineering) A symbol used to mark the center of a circle or partial circle on an engineering drawing.

Alternative spelling of laundry mark

(archaic) An identifying marking, usually in coded form and handwritten in indelible ink on an inconspicuous area of a garment, widely used until the mid-20th century as an organizing aid by merchants who cleaned and pressed clothing.

(linguistics) A symbol used to indicate tones in tonal languages.

A question mark.

someone who is easily fooled or victimised

Short for Deutsche Mark.

The proposed punctuation mark ؟ or ⸮, used to suggest irony or sarcasm in a question.

(computing) A form of garbage collection in which every accessible object in memory is flagged, leaving unflagged only those that are no longer reachable and can thus be discarded.