Grand Drape (house curtain or act curtain) 
Stage Backdrop (flat curtain, often used for theatrical scenery) 
Traveler (often two overlapping curtain halves) 
Tableau (Tab curtain, two curtains overlapping) 
Contour (full curtain with vertical draw) 
Austrian/Braille (front curtain, vertically lifted) 
Teaser/Tormentors (horizontal and vertical masking pieces) 
Legs / Border (for masking, additional stage depth) 
Scrim (transparent stage curtain) 
Cyclorama (Cyc, largest piece of scenery)