nailhead

1. Rail lines break the traditional boundaries and nailhead tail in pursuit of the beauty of the screen for the free play.
   线条打破传统铁线和钉头鼠尾的界限，以追求画面的美感为目的，自由发挥。

noun

1. flattened boss on the end of nail opposite to the point

2. something resembling the head of a nail that is used as an ornamental device