What is this pin for on the creality v2.2.1 board for? : r/CR10

Creality 4.2.7 Pin Diagram

Creality cr10 What is this pin for on the creality v2.2.1 board for? : r/cr10

What is this pin for on the creality v2.2.1 board for? : r/CR10

What is this pin for on the creality v2.2.1 board for? : r/CR10
What is this pin for on the creality v2.2.1 board for? : r/CR10