0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
A ray of electromagnetic radiation that follows the path of least possible propagation time between transmitting and receiving antennas. (188) Note: The path of least propagation time is not always the shortest distance path.