iPhone X Home Plate
It's a little crazy that John Gruber of all people didn't think to call the home indicator, "Home Plate".
Apple seems to be going out of its way not to give the horizontal bar at the bottom of the iPhone X user interface a name. For example, in the “getting started” pamphlet that ships in the iPhone X box, they don’t give it a name. They just show a picture of it, with an arrow indicating the gesture, and say “Swipe up to go home.”
-John Gruber, “iPhone X’s Home Indicator”, Daring Fireball