Lis, fleurs and trefoils are seemingly used interchangably... depending on how clear they are. If it looks like a French fleur de lis then either lis or fleur are used, if it looks like three blobs then trefoil. If it's for blobs then quatrefoil. Needless to say it can get complex, it's quite in depth stuff. You're not doing bad with that Spinks, it's a catalogue designed (especially the hammered section) for those that know hammered coins, people that know what fleurs and lis and cusps etc are. Not very user friendly i find and not very informative.