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Initially, I thought a little rhombus behind the names is a crown of topper in reputation. Then, I thought it signifies the site administrator

Thirdly, I thought it is written by the user himself :-) users in P. S. E.

which one is right?

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Your second guess is closest. The diamond $\blacklozenge$ behind the username signifies moderators or SE team members. The Phys.SE moderators are listed here.

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