A fleur-de-lis is an abstract representation of a lily or an iris flower. It's hard to describe in words, so look at the picture. The plural is fleurs-de-lis, and a semy of them would be fleury-de-lis . There are some edge-treatments, where the edges of lines of divisions are shaped like fleurs-de-lis, or perhaps the ends of a cross. In that case, the terms Fleury (flory) or Fleuretty are used. There are some technical differences between these uses, but I won't get into them here.