– FIRE RESISTIVE. Referring to the following standards::

IEC 60331: Tests for electric cables under fire conditions. Circuit integrity.

The difference between Retardant and Resistive is that Retardant resists the spread of fire into a new area, and Resistive maintains the circuit integrity and can continue to work (under specific conditions) for a time.

To learn more about common cabling acronyms: CABLING ACRONYMS