: If you saw this on a site, it is a feature designed for all-inclusive search indexing , ensuring that users looking for "all episodes" ( все серии ) of a specific numbered series can find the entire set quickly.
: The term " WEB13 " is often a release group tag or a quality identifier (Web-DL) for digital releases. In these contexts, the "feature" is the centralized availability of every single episode in one digital package.
A key "feature" or interpretation of this string relates to its potential origin:
50 лучших русских сериалов смотреть онлайн - Иви