# Tag triangle and triangles

1. Why do we have tags and then again ?
2. They both seems to have exactly same description. So maybe I am missing something.
• See here. It is common that old tags will be changed to its plural form (when spotted). – Arctic Char May 13 '19 at 19:54
• So it is not really two tags. When you click "triangle", it brings you automatically to the tag "triangles" – Arctic Char May 13 '19 at 19:55

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 .
• interesting example and meta example are a bit different in my book but I guess you could just redirect them ;) – Jack Tiger Lam May 14 '19 at 12:10