Does anybody know what Cr-MV stands for?

Hi, I bought some tore bit from eBay and they were advertised as Cr-V but all bits have Cr-MV written on them.
Couldn’t find any information on google besides Cr-V and Cr-Mo.

Chrome (Cr) - Molybdenum (M) - Vanadium (V) - all metallic elements used as alloy components in steel that is often used in gun barrels etc.

Compared to Cr-V, would the CR-MV tools be less resistant to torque?