ren - This is your name. It's what your family and friends call you.
The name of a person, the social identity.
rosette stone - This is a black rock that a French soldier found. It has Egyptian hieroglyphs and other languages written on it. This rock helped people figure out what hieroglyphs mean.
A round, black slab found by the French office Bouchard in 1799 by the village Rosette. Its bilingual inscriptions were the clues to Champollion to resolve the hieroglyphs. The text was in hieroglyphs, hieratics and in Greek.