Christmas tree

[Renato]

Christmas tree in Drag Racing. The name given to the lighting system used to start the race. It has five yellow lights that flash at half-second intervals, leading to a green sixth light that will signal the start of the race. There is a red seventh light, that will come on if a car advances too early. If this happens, the driver is automatically disqualified from the race.

[Justin Bieber]

The valves and fittings installed at the top of a gas or oil well to control and direct the flow of well fluids.