While researching terminology about street art for the manuscript I'm finishing I needed to know some word inherent to tagging.
Wikipedia glossary of graffiti offers an exhaustive list.
Vitry-sur Seine is on my list of places to visit
C215 is the king writer and thanks to his worldwide influence, Vitry's governors opened the city's walls to graffiti artists, thus making it known to international street artists. Two books are published on Vitry's street art, the first sold out quickly.
Here is one of C215's comissioned murals in Paris's 13th arrondissement.