Tenet.2020.720p.bluray.hindi-english.dd5.1.x264...

This stands for Dolby Digital 5.1, meaning it supports six-channel surround sound.

The post likely provides the movie with both the original English audio and a Hindi dubbed version. Tenet.2020.720p.BluRay.Hindi-English.DD5.1.x264...

This refers to the video compression codec used to keep the file size manageable while maintaining visual quality. Common Elements of Such Posts This stands for Dolby Digital 5