The Kubrick Stare
"In that showdown, and at several other times in the film, Kubrick indulges his favorite closeup, a shot of a man glowering up at the camera from beneath lowered brows. This was the trademark visual in A Clockwork Orange, and Jack Nicholson practiced it in The Shining. What does it mean? That Kubrick thinks it's an interesting angle from which to shoot the face, I think."
— Roger Ebert
with credit to zomgmouse.