Controller Area Network. That is probably a copywrited acronym as it is Bosch's nomenclature for their specific network protocol.
In other words speed is interpreted by the traction control, viewing wheel speed sensors and transfered to whoever needs such a signal digitally over the CAN. To the instrument cluster in this case. The speed is indicated by a meter movement as is the gas gauge.
Bosch Master, ASE Master, L1
33 years MB technician