This refers to the resolution. While 1080p and 4K are more common today, 720p (1280x720 pixels) remains a "sweet spot" for many collectors because it offers High Definition quality while keeping file sizes small enough for mobile devices or older hardware.
While the string looks like a jumbled mess of characters, it is actually a highly specific "release tag" used in the world of digital media archiving and peer-to-peer file sharing. pitchblack2000720pbrriphindidualaudiove verified
Often, these verified releases include multiple subtitle tracks (SRT files) for accessibility. This refers to the resolution
This identifies the movie. Released in 2000 and directed by David Twohy, it’s the film that introduced the world to Vin Diesel’s anti-hero, Richard B. Riddick. Riddick
Searching for specific keywords like this is often a way for enthusiasts to avoid "fakes" or low-quality "CAM" (camera-recorded) versions. A "Verified" tag usually implies the release comes from a reputable encoding group known for: