Correct angle for a window sill?

I personally know of no code requirements as to minimum angle of exterior sills, except as common sense dictates....that they should be less than 90 degrees to the window unit/panes and thereby allow any liquid water to run off and away from the unit.

Standard angle is 14 Degrees

Positive 14 degree (or 3-12) pitch

I don’t understand these measurements. I was told and slso saw something online that said the outer sill should be about 3/4 of an inch slope. Can someone explain that tome