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
1. The electrical symmetry, with respect to ground, of the two wires of a pair (188) 2. An expression of the difference in impedance of the two sides of a circuit.