The Citroën logo is the 'double chevron', referencing Citroën's early work on the 'herringbone'
or double helical gear, but there are other theories about this.
Citroën, was Jewish and also an internationally well-known Freemason, attached to the Lodge of "La Philosophie Positive" in Paris.
The logo may be interpreted as a masonic symbol - a double masonic square or a double masonic compass, associating the masonic ideology of Citroën with his invention of the double helical gear.
In masonry, the compass is associated with the symbolism of the 'architect's tools', so it is possible that Citroën used a double compass to represent his invention, in a masonic way.