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  1. Why do we have tags and then again ?
  2. They both seems to have exactly same description. So maybe I am missing something.
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    $\begingroup$ See here. It is common that old tags will be changed to its plural form (when spotted). $\endgroup$ – Arctic Char May 13 at 19:54
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    $\begingroup$ So it is not really two tags. When you click "triangle", it brings you automatically to the tag "triangles" $\endgroup$ – Arctic Char May 13 at 19:55
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Having posted the linked meta answer in the comments, perhaps I can give an answer.

  1. As @ArcticChar has mentioned, it's a convention to pluralize tags if possible, like , , etc. In such case, the tag name is used to refer to multiple objects of a category, instead of a single one. For example, is used for questions involving $\int_0^1 f(x) \, \mathrm{d}x$, $\int_a^b g(t) \, \mathrm{d}t$, etc. The fact that I posted the meta answer addresses the "and then" in the question.
  2. They are tag synonyms. A synonymous tag can get remapped to another one. For instance, is redirected to since the former is easier to type. This feature enhances user experience. Another interesting example is , which is synonymous to .
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    $\begingroup$ interesting example and meta example are a bit different in my book but I guess you could just redirect them ;) $\endgroup$ – Jack Lam May 14 at 12:10

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