cat's eye

noun5

1. •
   [usually plural] (Commonwealth) A retroreflective device placed on a road surface as a marking that can be seen even at night.
2. •
   A glass marble with elongated colourful inclusions running through its axis.
3. •
   A gemstone exhibiting chatoyancy.
4. •
   Cymophane (translucent yellow chatoyant chrysoberyl).
5. •
   (New-Zealand) A sea snail, Lunella smaragda