Compact Polarimetric (CP) mode is a new dual-pol mode introduced in the last decade. The main current CP mode transmits circular polarized waves. Data in the form of Stokes parameters obtained by this mode has rotational invariance. https://www.spidertattooz.com/OPI-Infinite-Shine-All-Your-Dreams-in-Vending-Machines-ISLT84-p27376/