This is part of a herringbone gear wheel.
André Citroën*, the founder of the Citroën motor company bought the patent for the gear and from it devised the double helical gear.
The Citroën logo is attributed to the chevron formation of the herringbone gear wheel.
I made this pic. as an illustration of the logo's supposed derivation and as a photoshop exercise: https://365project.org/dulciknit/on-the-day-extr/2021-10-30
Critique welcome. Veteran 365er (2011 vintage) and photography opsimath thanks to 365. Only posting occasionally and irregularly now but still having lots of serious fun...