What is the Emei Thorn?

According to legend, the "Emei Thorn" is a short combat weapon used in ancient water battles, which can be used in the water for stabbing or submerged underwater to cut through the bottom of a ship, so it is also known as "Emei Thorn in the water". Later changed to land application, invented by a monk in Emei Mountain, so it is called "Emei thorn". Another theory, Emei thorns for a martial arts master in Shu created, because the arm is shaped like a goose's eyebrow, so it is named.