Actually, the world have inherited something well known from compagnons : the word "chef d'oeuvre". It's translated as "masterwork" in this article, but it's something a bit more specific for compagnons : any compagnon is supposed, at the end of their "compagnonage" (companionhood) to realize their chef-d'oeuvre, the piece that should be the best thing they'll ever do in their live and that will be used as a rite to end their education. It's their thesis, on some sort.