FoxTrax
FoxTrax (colloquially also called the glow puck, smart puck, laser puck, Fox Puck, or super puck) was a specialized ice hockey puck with internal electronics that allowed its position to be tracked designed for NHL telecasts on the Fox television network. Primarily, it was used to visually highlight the puck on-screen and display a trail when the puck was moving rapidly.
Read more about Foxtrax.