IT'S A F@#&ING KNOB! Just because you're Apple doesn't give you the right to call it a "digital crown".
If I build a car with a joystick instead of a steering wheel and call it a "digital steering wheel" everyone would say, "No, somebody invented that already, it's called a 'joystick'"... they would not say "I am going to educate the uninformed and tell them that among car connoisseurs, a joystick is called a steering wheel."
The crown on watches and the crown on Apple Watch look the same. It's a crown with digital functionality. Thus, the digital crown.