In French, starboard and port are "tribord" (same etymology as "starboard", through Dutch) and "bâbord" ("back (of the oarman) board").
On stage, they are "côté cour" and "côté jardin" because the "Comédie-Française" theatre during the 1770 was in the Tuileries palace, and the stage was oriented with the Louvre courtyard on its right, and the Tuileries garden on its left.
On stage, they are "côté cour" and "côté jardin" because the "Comédie-Française" theatre during the 1770 was in the Tuileries palace, and the stage was oriented with the Louvre courtyard on its right, and the Tuileries garden on its left.