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2$\begingroup$ See here. It is common that old tags will be changed to its plural form (when spotted). $\endgroup$– Arctic CharMay 13 '19 at 19:54
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1$\begingroup$ So it is not really two tags. When you click "triangle", it brings you automatically to the tag "triangles" $\endgroup$– Arctic CharMay 13 '19 at 19:55
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Having posted the linked meta answer in the comments, perhaps I can give an answer.
- As @ArcticChar has mentioned, it's a convention to pluralize tags if possible, like cubic-equations, definite-integrals, etc. In such case, the tag name is used to refer to multiple objects of a category, instead of a single one. For example, definite-integrals 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.
- They are tag synonyms. A synonymous tag can get remapped to another one. For instance, ode is redirected to ordinary-differential-equations since the former is easier to type. This feature enhances user experience. Another interesting example is tag-synonyms, which is synonymous to tag-management.
answered May 13 '19 at 20:56
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2$\begingroup$ interesting example and meta example are a bit different in my book but I guess you could just redirect them ;) $\endgroup$ May 14 '19 at 12:10