真しん空くう蛍けい光こう管かんMeaningsNoun1. vacuum fluorescent tubeKanji used真truth空empty air蛍firefly光ray管pipeComposed of真しん空くうvacuum; absolute void; complete vacuityNoun蛍けい光こうfluorescenceNoun管かんpipe; tube; wind instrument; vessel; duct; tract; canal; counter for tube-shaped objectsNoun