1) Shade of gray 
In heraldry, cendrée is a tincture, the grey of ashes (French cendres), iron, and stone walls. It is rare in Anglophone heraldry, but common in Germany and to a lesser extent in France. In Italy it is often replaced by bleu celeste. A rare British example is the arms of Uplawmoor Primary School (Public Register vol 81, p 62): Tierced per pale: fi...