Related Clues:

• Doughnut-shaped figure
• Thing on the cover of 'Dark Side of the Moon'
• Spectrum-forming solid
• Die in Las Vegas, e.g.
• Dice unit
• Spectrum-showing device
• Kind of root or steak
• Color-full device?
• Optics device
• Bender of rays
• Shape for Rubik
• Color refractor
• 94 Down shape
• Light-bending device
• Hole thing