Operating buttons with disappearing triangular indicia

摘要: Directional indicators on the control buttons of an electrical for a light dimmer or motor controller are formed by triangular lines with vertices pointing away from one another and in direction related to change initiated pressing button. The indicia narrow length less than about hundred thousands inch, tend disappear view as observer is farther buttons. right triangles adjacent spaced hypotenuses fit into rectangular area. On/off same color atop below