Why is the letter created in Mesopotamia called cuneiform?

This is due to the fact that they wrote in cuneiform on clay tablets, with a sharp stick they carved symbols on the clay. It is known that in the 1st millennium BC. in the capital of Assyria, Nineveh, a large library was created, the basis of which was made up of clay books. Even though the city was destroyed and burned, most of the clay tablets were able to survive.