Thus yet another clever French brand name for the urban bus network in the Versailles area. Note, by the way, that the town is not, as often quoted, "a suburb of Paris", it is a separate community with its own administration. You would be thrown in the Tower for suggesting that HMQ's Windsor pad was in "a suburb of London"!
Also spotted was a bus with the odd name "Sqy", possibly pronounced "squee".
... hence the network name. In case you wondered who SQY bus actually are (and you were curious, weren't you?); it is a wholly owned subsidiary of RATP, the Paris City Transport operator. Imagine Transport for London operating buses in Southend!
Le Syndicat des Transports d'Île-de-France (STIF), établissement public administratif, est l'autorité organisatrice des transports de la région Île-de-France. Les membres du STIF sont La Région Île-de-France et les départements de cette région : Essonne, Hauts-de-Seine, Paris, Seine-Saint-Denis, Seine-et-Marne, Val-de-Marne, Val-d'Oise et Yvelines.
Think, for a UK example, of something like a Passenger Transport Authority, a political co-ordinating and planning structure. You may remember that fbb's Paris tickets were branded (and thus valid) on the designated range of STIF services.
We will see tomorrow!