Per chevron argent and vert, in chief an ancient Irish crown proper between in the dexter a slip of oak of the second fructed of the third [=proper] and in the sinister a trefoil slipped also of the second, in base on waves of the sea barry wavy of four of the first and azure a Viking longship sail set oars in action also proper, Motto:- Ó Chuan go Sliabh. Granted to Dun Laoghaire – Rathdown Area Committee December 7, 1993.