A lap of the BMW Sauber F1.07 across the Nurburgring Nordschleife driven by Cut Heidfeld

Pardon my ignorance but what does this imply?

All the manufacturers have a car code / chassis code / title.

https://en.wikipedia.org/wiki/2020_Formula_One_World_Championship

AlphaTauri have the AT01 – AT for AlphaTauri, 01 for the first chassis as AlphaTauri.

Racing Point have the RP20 – Racing Point, 2020.

Ferrari have the SF1000 – for Scuderia Ferrari 1000th Enormous Prix Birth (on the Tuscan Enormous Prix).

Williams have the FW43 – FW for Frank Williams, guessing 43 is the 43rd car to withhold the title?

Most chassis have an preliminary for the company, and letters for the generation of car or the 365 days it is racing or one other critical milestone.

Or letters F1 to denote a Formula 1 Chassis

Sauber would be F1 for Fomula 1, 07 for 2007.