What is the name of the contour around the ancient Egyptian hieroglyphs depicted in the photo?

In Egyptian hieroglyphs, a cartouche /kɑːrˈtuːʃ/ is an oval with a horizontal line at one end, indicating that the text enclosed is a royal name. The first examples of the cartouche are associated with pharoahs at the end of the 3rd Dynasty, but did not come into common use until the beginning of the Fourth Dynasty under Pharaoh Sneferu. While the cartouche is usually vertical with a horizontal line, if it makes the name fit better it can be horizontal, with a vertical line at the end (in the direction of reading). The Ancient Egyptian word for it was shenu, and it was essentially an expanded shen ring. In Demotic, the cartouche was reduced to a pair of brackets and a vertical line.

Of the five royal titularies it was the prenomen, the throne name, and the "Son of Ra" titulary, the so-called nomen name given at birth, which were enclosed by a cartouche.

At times amulets were given the form of a cartouche displaying the name of a king and placed in tombs. Such items are often important to archaeologists for dating the tomb and its contents. Cartouches were formerly only worn by Pharaohs. The oval surrounding their name was meant to protect them from evil spirits in life and after death. The cartouche has become a symbol representing good luck and protection from evil.