: This identifies the HEVC (High-Efficiency Video Coding) compression standard used. It provides high video quality at a smaller file size compared to older standards.

If you are looking for a for this specific file,

Rocket — Season 1, Episode 1 (Version T02) Technical Specs: Encoded in high-efficiency x265 with AAC audio. Summary: The series premiere of Rocket . This file contains the second take/edit of the first episode, optimized for high-quality playback with minimal storage impact.

: This stands for Advanced Audio Coding , which is the format used for the audio track.