In cinematography, a low-angle shot, is a shot from a camera angle positioned low on the vertical axis, anywhere below the eyeline, looking up. The trunk shot is a specialized type of low-angle shot. It makes the object look strong and powerful including great. A shot taken with the camera placed in a position below and pointing upward at the subject. Low Angle is the name for this kind of shot, because the camera is low. It's useful because it can make people look powerful. But avoid it for most general shooting. Similarly, shooting up at someone makes them seem powerful and dominant. This is called a "low angle" shot. Watch any old horror movie and you will notice that the monster is always shot from a low angle typically with the camera on the floor.
M (1931) (directed by Fritz Lang): Inspector Karl Lohmann is shot in low angle in his office, the camera sitting underneath his office desk. Also, two disputing men, one small and the other tall, are shot in low and high angles, respectively.
Citizen Kane (directed by Orson Welles): there are many examples such as during the scene where Kane fires Leland. In fact, the scene where Leland confronts Kane after his defeat in the election is entirely shot in a low angle view.
Star Wars (directed by George Lucas): Darth Vader is often shot at a low angle, for example, the first time we see his character as he is walking down a hallway.
Touch of Evil (directed by Orson Welles): In this film noir, Hank Quinlan is often shot in low angle to make him look menacing, large, and in-charge.
Saturday Night Fever (directed by John Badham): In the famous opening sequence, there are several shots from a low angle to emphasise Tony Manero's delusions that he is untouchable, and his self-importance that he harbours for much of the film.
The Dark Knight (directed by Christopher Nolan): Nolan uses extremely low angle shots to give the Joker a more powerful image in The Dark Knight, especially during the scene where the truck he was driving is flipped over and he gets out and starts shooting at Batman. In this scene, the angle actually goes from a normal medium close up and slowly moves into a low angle shot.