I always get width and length confused in this context. My incorrect mental model has been - "source is on the left and drain is on the right therefore width is

I always get width and length confused in this context. My incorrect mental model has been - "source is on the left and drain is on the right therefore width is the distance between those." Thanks for the clarification. >"What a FinFET does is ask, instead of turning on a MOSFET channel by having the gate act on it from just one side, why not have the gate act on it from 3 sides by sticking it out of the silicon substrate and surrounding it by the gate" This was a nice way of articulating this and makes good sense. Thanks.