change-over cue

Change-over cue is a small dot, oval, or mark on the top-right corner of a film frame that signaled to the projectionist to change over from one projector (or film reel) to another (about every 15-20 minutes). Today, most film theaters have only one projector. The reels are spliced into one giant roll and fed into a single projector from a horizontal revolving turntable called a platter.