I'll agree with Stefan that this term gets mixed usage. What Stefan refers
to is mainly a consideration for high altitude aircraft. The U2 is the
plane that instantly comes to mind. Think about pulling back, stall...
Think about pushing forward Vne.... not much room in between.

What I refered to in my response, I generally refer to as the Deadman's
Corner, it instills the seriousness of proper airspeed control,
coordination, and patience when teaching primary students proper landing
patterns.

Jim