A cardan joint is a universal joint that enables the linking of two intersecting driveshafts. It was patented in 1664 by Robert Hooke, and was a development based on Geronimo Cardano's ring joint, hence the name 'Cardan'.
A constant velocity joint is a mechanical coupling in which the rotational speed of the output shaft is the same as that of the input shaft whatever the operating angle of the joint.
See SX countertrack TM and High Speed PX countertrack TM Joint
See SC crossrack TM and High Speed PC crosstrack TM Joint