二に極きょく真しん空くう管かんMeaningsNoun1. diodeKanji used二two極extreme真truth空empty air管pipePitch accentにきょくしんくうかんComposed of二にtwo; 2Numeric極きょくpole; climax; extreme; extremity; culmination; height; zenith; nadirNoun真しん空くう管かんvacuum tubeNoun