This indicates the resolution of the video (1280 x 720 pixels), which is considered Standard High Definition.

The file extension (Matroska Video), a container format that can hold multiple audio and subtitle tracks within a single file. Common Characteristics of Such Files

This is the name of the website or release group that distributed the file.

For a safer experience, you might consider using such as Tubi or Pluto TV , which offer free, licensed content. Plex Media Server Naming Conventions // Movies

This likely refers to the movie title or a specific "loaned" release category.