Used to describe a type of pin for use with casement stays and fasteners "EJMA pins". The letters stand for English Joinery Manufacturers Association and refer to a 9 degree splay profile on the outer frame and sash. The pins or fastener wedges are bevelled to accomodate this splay so that they are straight when fixed. Some manufacturers supply both types of pin or wedge with their product to accomodate this and some provide an adapter plate. The image below shows a casement fastener with both a straight and an EJMA wedge plate.