Upstop Wheel/Underside Wheel: The undertrack wheels that lock a car to the track.
Unloading Platform: The part of the station where riders get off out of the coaster cars. On older rides this was often in a different place than the loading platform. On newer rides the loading/unloading area are in the same place, on opposite sides of the coaster track.
Vertical Loop: A 360 degree turn in a vertical sense, turns the riders upside down. What is most commonly thought of as a 'loop'
Walkway/Walk Boards: A passageway, to the side of, or between the tracks of a coaster, to provide a means of access for the maintenance crew to inspect the trackwork. Also used as a way to evacuate the train in case of mechanical/electrical failure.
Water Splash (Splashdown Finale): A steep drop. The track after the drop runs under a tank of water, so that the water slows down the train, creating big waves that drench the riders, and by-standers.
Woodie: Slang for wooden coaster.
Wristband: A device, used by parks with an admission scheme that is more flexible than either of the two extremes (Pay one Price, or Pay per Ride), this consists of buying a bracelet, designed either of plastic or Tyvek 'untearable, water proof' paper. These are designed so that they can be put on the rider easily, but taking them off requires destroying the wristband. The wristband serves as an 'unlimited' ticket and is treated like a Pay-onePrice arrangement. This allows parks to admit both ride-lovers, and park-lovers and charge fair prices to both.