Millrind, Millrine, Millrynd, Fer-de-Moline, Fer-de-Mouline, Ink-moline

Fer-de-mouline is the original name for the iron which is set in the centre of a millstone to hold it in place.  It is now commonly called a millrine or millrind and was drawn in various shapes, the most common being the 1st and 2nd illustrated above. When with a square or quadrangular centre it is sometimes found blazoned quadrant millrind. An early blazon describes it as  two crescents addorsed and coupled by two plates.

See also Cross Millrind and Cross Moline