I find below article to be a cool explanation of that device, while actually showing shape Bosch uses in that logo. https://www.da7c.co.uk/technical_torque_art

I find below article to be a cool explanation of that device, while actually showing shape Bosch uses in that logo. https://www.da7c.co.uk/technical_torque_articles/magneto_ignition_explained.html https://www.da7c.co.uk/technical_torque_articles/magneto_ign... But yeah, it's magneto ignition device, pre-sparkplug.