We claim the ornamental design for a three point knob, as shown and described.
FIG. 1 is a perspective view of a three point knob, showing a top side my new design;
FIG. 2 is a perspective view thereof, showing a bottom side my new design;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing a threaded shaft in the figures are included for the purpose of illustrating the invention in use, and form no part of the claimed design. The broken lines in FIGS. 2 and 7 form no part of the claimed design.
Vehicle braking system brake bias adjuster having a visible brake bias ratio indicator and method and apparatus for retrofitting a vehicle with a vehicle braking system brake bias adjustment knob assembly having a visible brake bias ratio indicator