This likely refers to one of two major 2022 releases titled Beast :

Stands for Dolby Digital 5.1 surround sound. This configuration includes five full-bandwidth channels (Front Left, Front Right, Center, Surround Left, Surround Right) and one low-frequency effects channel (the ".1") for a subwoofer. 3. Video Resolution

Indicates the file contains two separate audio tracks that you can switch between while watching.