女皇 is read as じょこう (jokou) and means empress.
じょこう
jokou
おんなきょうこう
High Priestess (Tarot card)
じょせいてんのう
female emperor (of Japan)
じょけいてんのう
matrilineal emperor of Japan
こうじょ
imperial princess
にょうぼう
wife (esp. one's own wife)
じょろう
prostitute (esp. Edo period)
じょてい
empress
にょうぼうやく
assistant
じょせい
son-in-law
にょにんけっかい
prohibition against women entering a sacred area
おんなむすび
square knot (starting with a left loop)
おんなどうし
fellow women