And that, kids, is why we call it a “Patch”
My favorite is "log", named after logbooks. Logbooks have maritime origins, where the ships speed is recorded. Even today, speedometer on ships are in many languages called "a log" since the original method consists of throwing an actual log overboard with a string attached to it. The string would have knots with regular intervals. To determine the speed, you count how many knots pass through your hand in a certain time.