The following is a draft overview regarding the Tekken Tag Tournament 2

The term does not appear in any official Namco documentation. In the context of PS3 scene releases, it is likely a typo, a specific hash, or a reference to a scene group or uploader’s signature.

A DLC PKG file is a downloadable content package for the PlayStation 3, which contains additional game content, such as new characters, stages, costumes, or other game modes. In the case of Tekken Tag Tournament 2, DLC PKG files can enhance your gaming experience with fresh and exciting content.