Su is the shortened form of Suzhou, a city of with moderate climate, which has a prosperous industry of sericiculture and hence highly-developed technics of embroidery.

• 苏州位于中国江苏省南部，这里气候适宜，是中国桑蚕业的发达地区。桑蚕业的发展带动了刺绣业随之繁盛。