: This stands for Dolby Digital Surround or sometimes more specifically for DTS (DTS: X, DTS-HD Master Audio, etc.), which are audio encoding formats. DTS is known for its surround sound technology. In this context, it likely indicates that the file includes a DTS audio track.
In terms of solid features for this movie file based on the provided information: Kubi.2023.1080p.BluRay.x264.DTS-WiKi