What is the symbol on King Tutankhamuns mask?

Answer 1

You mean "What is the snake symbol on the cartonnage mask of pharaoh Tutankhamun?".

Cartonnage is a form of paper mache made from papyrus, linen and plaster, often covered with gesso and gold leaf before being painted.

This cobra emblem represents royalty and the goddess Wadjet, and is seen attached to most types of royal crown. It is known today by its Greek name: uraeus, but the ancient Egyptians had their own words for it, written tpt or iart in hieroglyphs.

In fact the mask has many other, less obvious symbols: the eyebrows and eye make-up are symbolic of various gods and goddesses, the gold represents the flesh of the gods, the blue nms wig cover is a symbol of royalty, the elaborate necklace is a symbol of Isis or Hathor and so on.