Quin n. : A European scallop (Pecten opercularis), used as food.

Example:
batman arkham asylum how to do riddle when the door is locked after harley Quin leaves?

Taxonomy
Quin, Dugall Quin, free encyclopedia, character, Andy Quin, Ann Quin, Barry Quin, 21st century, Betty Quin, Huston Quin, James Quin, Michael Joseph Quin, the United Kingdom, Joyce Quin, Baroness Quin, search, folk ballad, short story collection.

Defination from the web:
Quin (1876-1938), mayor of Louisville, Kentucky. James Quin (1693-1766), English actor ... Percy Quin (1872-1932), American politician. Quin Snyder (born 1966), current head coach of the NBDL's Austin Toros. Valentine Quin, 1st Earl of Dunraven and Mount-Earl (1752-1824), Earl ...