The Nordic Spec Sheet Nordic Semiconductor Infocenter for NRF9160 covers all the information needed to figure out the part marking and ordering code. So, for an order code suffix example, if we were to look at the B1A suffix in part number NRF9160-SICA-B1A-R, this refers to the “Build Code” for the hardware version, production configuration, and firmware version.
Image’s compliments of Nordic Semi ordering information section