1. A person who handles the controls of an aircraft or spacecraft from within the craft, and guides or controls the craft in flight.

2. A mechanical system designed to exercise control functions in an aircraft or spacecraft.

1. In a transmission system, a signal wave, usually single frequency, transmitted over the system to indicate or control its characteristics.

2. Instructions, in tape relay, appearing in routing line, relative to the transmission or handling of that message.

A model of a computer system designed to test its design, logic, and data flow under operating conditions.

A bullet- nosed cylindrical component used in a die that enters prepunched holes of a metal strip advancing through a series of operations to assure precise registration at each station.

A cylindrical steel bar extending through, and about 8 inches (20 centimeters) beyond the face of, a reaming bit; it acts as a guide that follows the original unreamed part of the borehole and hence forces the reaming bit to follow, and be concentric with, the smaller- diameter, unreamed portion of the original borehole.

1. A person who directs the movements of a vessel through pilot waters, usually a person who has demonstrated extensive knowledge of channels, aids to navigation, dangers to navigation, and so on, in a particular area and is licensed for that area.

2. A book of sailing directions; for waters of the United States and its possessions, the books are prepared by the U.S. Coast and Geodetic Survey, and are called coast pilots.

3. The person who flies aircraft.