What's the meaning of `::` in `-tags :: Emacs Lisp`?

The following contents are used to set tags in org-mode:

- tags :: Emacs Lisp

My question is, what’s the meaning of :: here? Is it an org-mode keyword?

Yes, it’s a description list, one of the Org Mode’s plain list styles together with unordered and ordered lists.

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Thanks, got it. It’s really hard to find the doc that contains the explanation.