Tweeter A type of speaker designed specifically to reproduce high frequencies. Voltage The difference of electrical potential between two points of a circuit. Vomitorium A hallway where the actors can enter unseen from the middle of the audience. This area usually leads directly underneath the audience risers. The Roman theater had at least two, one on each side. Not only do actors use these for entrances and exits, but also the audience is often ushered in and out of the theater using them. Twist Bit A straight drill bit with spiral twists down its length. Typically used for metal but can also be used on wood, plastics, and many other materials. The front edge of each spiral is a cutting edge. The spiral design helps to remove the debris from the hole as you drill. These bits are usually made from high-speed steel, carbon steel, or tungsten carbide. Twisted Pair Has two center conductors twisted together. Many twisted pairs can share one insulation and jacket. All balanced audio cables are twisted-pair cables with a shield, which further protects the signal being transmitted from introduced noise. W Warning A verbal signal that a cue is coming up soon. Wattage The rate at which electrical energy is transferred by an electric circuit. U Upstage The area of the stage furthest from the audience. West Virginia A mathematical formula that can help you find the watts, volts, or amps if you know two of the three values. Utility Knife Also known as a mat knife. This type of knife comes in a metal or plastic handle. The blade is retractable, meaning it stores completely in the handle. It uses a two-sided blade. This Wet Blend Done by applying one layer of paint, and while it is still wet, applying a second coat that blends partially or completely with the first.