The mark comprises the product shape, characterized by a repeating uniform cross-grid pattern of a square including four intersecting ribs extending diagonally from opposing corners of the square in a symmetrical form with the squares having common sides and corners. The mark is used as a product configuration and consists of an array of four crossing grid members in a repeating pattern to form the surface of eight radiating triangles around a common point of intersection in a plastic tile, and including locking loops extending outward on two adjacent sides of the tile.