Chyron is a company who's products include tools for character generation, graphics, editing, compositing, and other such things for video and broadcasting. The hardware and software that they make are used for special effects and video editing.

Some examples of the things that they do is overlaying the score box on a live sports broadcast or combining two video feeds in different parts of the screen - this technique is often used in game shows to show the face of the contestant and the board at the same time.

As a specialized piece of hardware, it needs someone who is familiar with its workings to use it, thus the title "Chyron Operator".