This refers to vertical resolution (1920x1080 pixels). In 2012, 1080p was the gold standard for home theater enthusiasts. Today, it is considered baseline HD. The presence of 1080P tells us this is not a 4K upscale; it is a direct rip from a Blu-ray source.
Matroska Multimedia Container. The preferred container for pirates because it supports virtually any codec, multiple audio tracks, chapters, and soft subtitles (ironically, this file uses hard subs). MKV is flexible; AVI is dead. PROMETHEUS.-2012-.1080P.X264.NL.SUBBED.BRADJE.mkv
Based on the file naming convention, here is a breakdown of what that specific file contains: File Metadata Breakdown PROMETHEUS (2012) : The title and release year of the movie. : The video resolution ( pixels), which is standard Full HD. This refers to vertical resolution (1920x1080 pixels)