Start with what the BYD B series is: a Single-deck bus, double-deck bus and articulated bus with Electric wheel hub motor (TZ2912XSB/TZ290XSE) or single motor, built from 2020, in the decade the industry is turning electric. What it meant takes a little longer. The shape is credited to Wolfgang Egger.
Where it came from
The BYD B series are a line of battery electric buses produced by the Chinese vehicle manufacturer BYD. It is the first bus model powered by BYD's Lithium Iron Phosphate Blade electric-batteries. It is available as a 10-metre single-deck (B10), a 11-metre double-deck bus (BD11), a 12-metre single-deck bus (B12), a 12-metre tri-axle double-deck bus (B12D), a 15-metre tri-axle single-deck (B15) and a 18-metre articulated bus (B18).
Under the skin
The engine is Electric wheel hub motor (TZ2912XSB/TZ290XSE) or single motor. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
In context
In the Byd line-up the BYD B series has a clear place: it replaced the BYD K series; the factory was Hangzhou, Zhuhai, China. The cars a buyer would have weighed it against include the Tesla Model Y, the Porsche Taycan, the Kia EV6. Nearby in the Byd catalogue sit the BYD 8TT and the BYD Atto 2.