Cartouche

A cartouche is rectangle-like figure with semi-circular ends used in Egyptian hieroglyphics to enclose a royal name.

Téa Gardner gave Yami Yugi a metallic cartouche neck chain, so he could write down his name when he remembers it.

Yugi, Joey, Téa and Tristan later found Yami Yugi's real name, Atem, engraved on a wall. However they could not translate the hieroglyphics, but later they managed to copy the symbols as they remembered them on the metallic cartouche, enabling Atem to read his name.