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
In a hollow metallic waveguide, a longitudinally movable metallic plane surface that reflects essentially all the incident energy. Note: A piston is used for tuning, e.g., fine-tuning a resonant cavity. Synonym plunger.