chyron
A set of graphics or words at the bottom of a television screen, sometimes unrelated to the current viewing content.
Chyrons (electronically enlarged words or numbers superimposed on the screen) might be used to illustrate and compare budget figures or to emphasize a quote.
Where it comes from
Genericization of the trademark Chyron, from Chiron (“centaur of Greek mythology”).
Adapted from the Wiktionary entry chyron (CC BY-SA 4.0).