Abstract: A display device having a plurality of rotatable sleeve elements, with each sleeve element having a plurality of indicia on its outer surfaces and a through opening. The through opening has a uniform cross-sectional shape that is generally circular, with at least one notch extending beyond the perimeter of the circle. The opposing surface of each sleeve element has at least one protrusion (or indentation) that corresponds in shape and size to at least one corresponding indentation (or protrusion) on the mating surface. When a plurality of sleeve elements are slidably and axially placed over the body abutting each other, the unique shape of the through opening of and the protrusion-indentation combination on each sleeve element allow the frictional rotation of the sleeve element with ease, but locks it at a predetermined position to provide a message from the combined indicia on the sleeve elements.

Abstract: A display device having a plurality of rotatable sleeve elements, with each sleeve element having a plurality of indicia on its outer surfaces and a through opening. The through opening has a uniform cross-sectional shape that is generally circular, with at least one notch extending beyond the perimeter of the circle. The opposing surface of each sleeve element has at least one protrusion (or indentation) that corresponds in shape and size to at least one corresponding indentation (or protrusion) on the mating surface. When a plurality of sleeve elements are slidably and axially placed over the body abutting each other, the unique shape of the through opening of and the protrusion-indentation combination on each sleeve element allow the frictional rotation of the sleeve element with ease, but locks it at a predetermined position to provide a message from the combined indicia on the sleeve elements.