Medium Close Up
Medium Close Up is often abbreviated to MCU and this term appears in a script, storyboard or shotlist to describe the size of the shot. It usually relates to a person but can sometimes refer also to other objects as well.
For a shot of a person, an MCU will include the head and shoulders as shown above.
For a shot of a person, a WS will include all of the person from head to toe as well as a lot of the environment around them. If it's a group of people, then it will include all of them and their surroundings.For a building, you'll see all of the building, and so on.
A full shot of the person including the environment immediately around them. Not showing as much of the surroundings as in a wide shot.
For a shot of a person, an MS will include the head, the top half of the body and the arms and hands
For a shot of a person, an MCU will include the head and shoulders
For a shot of a person, a CU will be close enough to include all of the head and neck but not the shoulders
For a shot of a person, a BCU will include the eyes and mouth but not the whole head
For a shot of a person, an ECU will include just the eyes or perhaps the mouth but not the whole head