How is called such a knob / potentiometer?
Pot. Knobs come in 3 types "Flat" or D shape, Slotted and Knurled 20 or 40 teeth as well as various shaft length , 15 to 35mm in 5mm increments with linear and log. (audio) profiles and shaft diameters such as 6mm.

This would be a right angle PCB mount, log. , knurled 6mm 40 tooth, Pot.