cat's eye

/K AE1 T S AY1/
noun
  1. 1

    (usually in the plural) A retroreflective device placed on a road surface as a marking that can be seen even at night.

  2. 2

    A glass marble with elongated colourful inclusions running through its axis.

  3. 3

    A gemstone exhibiting chatoyancy.

  4. 4

    Cymophane (translucent yellow chatoyant chrysoberyl)

Source: https://en.wiktionary.org/wiki/cat's%20eye