Unable to answer "What number or code identifies this stop?" – Bus Stop – https://osm.org/node/13722473265 via StreetComplete 63.0:

There are many stops here; La Navette (no number), l'inter des Laurentides (no number), Circuit Argenteuil-Saint-Jérôme (Arrêt 99-10) and exo with numbers 509 and 709