What is the turtle's head?

Radical: knife

Explanation:

Turtle [Gu:]

A family of reptiles with hard armor on the abdomen and back. The head, tail and feet can be retracted into the armor, which can resist hunger and thirst and has a long life: black ~. ~ armor (tortoise's abdominal armor, which can be used as medicine, divination and currency in ancient times. Also known as "tortoise shell").

Turtle [jūn]

Same as "edge".

turtle

〉~ z(cí)〉 The name of China's Western Regions in Han Dynasty is in Kuqa County, Xinjiang Uygur Autonomous Region today.