The Emerson Wave Shaped Feature ® is a registered trademark of Ernest and Mary Emerson. It is the design aspect that distinguishes an Emerson Knife. The Emerson Wave Shaped Feature ® can be identified by the distinct wave shape located on the spine of the blade, with the crest facing toward the tip of the knife and incorporating rolling ridges on the top and continuing toward the rear of the spine of the blade. Again, this feature distinguishes the knife as an Emerson Knife.