Are you asking what a circular shower is? A stainless steel column about 10-12" in diameter, standing in the middle of an open shower room, with several showers heads and controls protruding equally around it, usually 4 to 6. Depending upon the size of the shower room, there may be only 1 or 2 columns, or a whole forest of them.
The men (I don't think women's showers ever use them) stand around each column to shower, forming a circle, hence the term. Since the men aren't facing against the traditional shower wall in long rows, but in the open and at right angles to each other at the columns, they can see each other's stuff pretty clearly without having to deliberately turn their heads to the side.
Depending on the shower room size & shape, column showers have the potential to accommodate more men at once than the traditional shower heads along the walls. Some plumbing repairs are easier compared to plumbing installed behind tile walls because of the columns' hollow, accessible design.