A female Ferengi disguises herself as a male in order to help Quark with business deals in the Gamma Quadrant.
Ferengi Rules of Acquisition:
Number 21: "Never place friendship above profit."
Number 22: "A wise man can hear profit in the wind."
Number 33: "It never hurts to suck up to the boss."
Number 48: "The bigger the smile, the sharper the knife."
Number 59: "Free advice is seldom cheap."
Number 62: "The riskier the road, the greater the profit."