What is the meaning of "un zéro" ? What is the meaning of "un zéro" in the following sentence? Quand un astronome découvre l'une d'elles, il lui donne pour nom un zéro. The above sentence is from "Le Petit Prince". In some books, "un numéro" is used instead of "un zéro". Which is correct? Has "zéro" same meaning as "numéro"?