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A revolving door is a type of door that, as its name suggests, revolves in its frame.
Most kinds of doors are bolted to the wall and are on hinges. They open only one way, for a theoretical maximum of 180 degrees rotation. Sometimes hinge-doors can open both ways in their frames, for a theoretical maximum of 360 degrees rotation. A revolving door, however, has a theoretical rotation maximum of infinity, as it is set on a rotating shaft.
 A revolving door, from in front and above. Around the shaft are several doors that are bolted to it and incapable of independent movement. The usual number of doors on a revolving door is four, although the number may be higher or lower. The doors may be electric (in which case there is a motor at the base of the shaft) or manual, in which case the doors have handle bars on them. When you push on the handlebar of the door in front of you, the entire shaft will rotate around.
Revolving door also refers to an arrangement between a government regulating agency and an industry whereby people move between the two groups frequently and easily, conjuring the image of a revolving door between the two, with connotations of overly close relationships and possibilities for abuse.
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