A slang term used to refer to the main curtain, house curtain, or grand drape in a proscenium theatre. May fly (guillotine) or travel, usually made of 100% fullness heavy velour. Can be simple or intricate, as the architecture and use of the venue warrants. http://www.sicoinc.com/portable_theater.php Photo from http://www.gerriets.com/en/custom_manufacturing/theater_curtains.php. See also the thread http://www.controlbooth.com/forums/...perations/18759-grand-main-house-curtain.html .