This stands for Advanced Video Coding (H.264), the compression standard used for the video stream.
: This is the most important tag for quality enthusiasts. It means the video and audio tracks have been taken directly from the original Blu-ray disc without any additional compression or "re-encoding." You get the exact same bitrates and quality as the physical disc. 1080p / AVC Prometheus.2012.1080p.BluRay.REMUX.AVC.DTS-HD.M...
like Plex or Jellyfin to stream it.