Woodruff key
/ˈwʊdrʌf/noun
- a key whose cross section is part circular, to fit into a curved keyway in a shaft, and part rectangular, used chiefly in machinery（横断面为半圆半方的）伍德拉夫钥匙。
词源
late 19th cent.: named after the Woodruff Manufacturing Company， Hartford， Connecticut， US.