A main stage is where a featured performer will dance as part of a rotation. In most clubs the main stage is a dominant feature of the layout and the center of activity. A common type of strip club main stage is the thrust stage, also known as a runway stage, but the other major forms are also used regularly. Theatre in the round is also a popular form of strip club staging for the main stage. During each set of one or more songs, the current performer will dance on stage. A dancer collects tips from customers either while on stage or while mingling with the audience after her performance. A customary tip (where customers can do so at the stage) is a dollar bill folded lengthwise and placed in the dancer's garter from the "tip rail". The area of the tip rail is equivalent to the apron in traditional theatre. It is referred to in slang as "ringside", "gynecology row", "pervert row", and other names.