Furison is an ancient word, now fallen out of use, but means fire-iron or fire-steel – the peice of metal struck against a flint to create a spark and ignite a fire. It has been used as play on words for families named STEEL or BLACK. A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P292