The release , specifically the 1080p WEBRip version with 5.1 audio and English subtitles (ESub) tagged by Katw, refers to the latest film by Academy Award-winning director Paolo Sorrentino .
This refers to the audio channels (Surround Sound: 5 speakers and 1 subwoofer).
indicates English subtitles are included. Since Parthenope is primarily in Italian and Neapolitan dialect, English subtitles are essential for non-Italian speakers. The “E” likely stands for “Embedded” (within the MKV container) or “External” (separate .srt file). In this release, it’s probably an MKV with soft subtitles.