The heraldic tressure, being very narrow, is usually found as a double tressure, a device similar in size and shape to an orle, but possessing a gap in the middle, something like the Cassini division in the rings of Saturn. The most famous instance of a double tressure is in the double tressure flory counter flory in the arms of Scotland. In this device, fleurs de lis are arranged across the tressure, their points alternately pointing inwards and outwards. It is traditional, but not compulsory, for there to be an outward-pointing flower in each of the corners of the shield or quarter, regardless of how many corners it has. The arms of the Queen Mother, as a Bowes-Lyon, also featured the double tressure flory counter-flory.