(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.

plural of tone mark

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

A question mark.

plural of interrogation mark

someone who is easily fooled or victimised

plural of D-mark

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.