双摆

双摆	shuāng bǎi	double pendulum (math.)
双	shuāng	variant of 双
双	Shuāng	surname Shuang
双	shuāng	two / double / pair / both / even (number)
摆	bǎi	to arrange / to exhibit / to move to and fro / a pendulum
摆	bǎi	hem (at the bottom of a garment)