an "upturn" beam is typically used in the ceiling of a top floor where the top of the beam extends into an attic, and a "drop beam" is used in the ceiling over a garage or anywhere that the bottom of the beam does not extend into a usable area.

What is the purpose of inverted beam?

Inverted beams are provided to avoid it's view in porch area or to have more head as per requirements. The girders provided for foot over bridges in railway stations are good examples of inverted beams. The girders are made inverted to get clear height available for electric wires and train.

What is reverse beam?

The Inverted beam is a reinforced concrete beam, different types shape of beam-like I beam, T Beam, L beam, etc. So, the height of the Inverted beam is the same as the normal height of a beam, as may be noticed in as per below fig.