Yup . CASTOR.
When Ford in 1964 used their first computer simulations to design the independent rear suspension on Shelby's 427 Cobra, they were actually able to design in some rear steering and anti squat when the rear suspension went into compression.
This aided in rear stability and straight tracking while under heavy straight line acceleration or accelerating out of turns where a bump might occur.
So at static (rest) or driving in a straight line with no acceleration or bump compression in the rear, the rear upright had a 2 deg negative CASTOR built into it (top of the upright leaning slightly forward).
Under hard acceleration or a bump (compression), the Upper Control Arm and leading Lower Control Arm links were so designed (with anti dive and some rear steer) as to move the top of the upright rearward and into Positive CASTOR and created some additional toe in on the rear to aid in directional stability.
I think.
It's really a complex rear suspension.
Cheers
Greg