Profile-alphabet reference plate. Game and puzzle designers use this plate as a physical reference for a modular interlocking system: each of the eight raised-letter blocks shows one mating profile, a male key, a female socket, a directional lug, a blank face, or a bridge-ready boss, so a matching set of pieces can be designed to the same proven shapes.

How it works. One base plate carries eight soft, rounded blocks in a four by two grid. Each block's front face is carved with a different mating profile: a male key, a female socket, a two-way key, a directional lug, a blank, and a bridge-ready boss, while a raised letter on top, A through H, identifies which one.

Material and finish. The whole plate prints as one piece: base and all eight blocks share a single continuous shell, so nothing needs gluing or assembly. Each block keeps the same soft, rounded cube profile and sits flush on the base, with its identifying letter raised rather than engraved and a fine, consistent layer finish across every face.