Chyron is a company who's products include tools for character generation
, compositing, and other such things for video
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".