Electronics (Mike Jaroch)
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Greek letter "rho" (ρ). Used in the field of electricity and electronics to represent the specific resistance of a substance .
A diamond-shaped antenna used widely for long-distance, high-frequency
transmission and reception .
RIGID COAXIAL LINE
A coaxial line consisting of a central insulated wire (inner conductor) mounted
inside of a tubular outer conductor .
The tendency of the spin axis of a gyro wheel to remain in a fixed direction in space if no force is applied to it .
In radar, the time during which the output of an echo box remains above a specified level .
RF oscillations caused by shock excitation of a resonant circuit or cavity .
The frequency of the ripple current. In a full-wave rectifier it is twice the input-line frequency .
The alternating component of unidirectional voltage. (This component is small
compared to the direct component.) 
An RL circuit in which the output is taken from the inductor .
An RL circuit in which the output is taken from the resistor .