Recently this question was marked by duplicate. Screenshot:

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I see an icon of gold badge near user marked question as duplicate (j08691).
And how did he marked it as duplicate alone, not being a moderator?

  • 2
    Oh cool, the badge is a nice addition. I like. But what's the bug?
    – mhlester
    May 14 '14 at 16:54
  • 3
    Tag gold badge holders can unanimously close as duplicate questions that are tagged with any tag in which they have a gold badge.
    – Oded
    May 14 '14 at 16:58
  • 1
    Hovering over the circle brings up a tooltip that explains it, even down to which tag granted the user permission to unilaterally close.
    – Troyen
    May 14 '14 at 18:13
  • @Troyen Ok. But I am on mobile now (and was).
    – nicael
    May 14 '14 at 18:15

This isn't a bug, but a feature recently introduced across all sites to allow users with gold badges in that tag to moderate duplicates in their tag with a single binding vote.

See https://meta.stackexchange.com/a/231212/165931

Several things I like about this feature:

  1. Over use of tags increases the change an expert can handle low quality / duplicate questions with quick results.
  2. Experts generally have a great sense of the domain and there are ways this is tracked and reviewable by others if needed (even if you don't consider flagging and comments).

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