Circled CubeA 3x3x3 truncated along the lines of two circles.
Circled Cube (Sharp Edges 92400000)A 3x3x3 truncated on 4 edges and afterwards extended. The result is similar to the Circled Cube from the same inventor.
Circuit CubeThis cube shows stickers that are designed based on lines instead of shapes and looks like a circuit board.