母线

母线	mǔ xiàn	generating line / generatrix (in geometry) / bus (in electronics) / bus bar
母	mǔ	mother / elderly female relative / origin / source / (of animals) female
线	xiàn	variant of 线
线	xiàn	thread / string / wire / line / CL:条,股,根 / (after a number) tier (unofficial ranking of a Chinese city)