gls-symbols.tex

\newglossaryentry{pi}{
  name = {{\ensuremath{\pi}}},
  description = {\leng{Pi number}\lrus{Число Пи}},
  symbol = {-},
  type ={symbols}
}
\newglossaryentry{radius}{
  name = {\ensuremath{r}},
  description = {\leng{Radius}\lrus{Радиус}},
  symbol = {\si{\metre}},
  type ={symbols}
}
\newglossaryentry{area}{
  name = {\ensuremath{A}},
  description = {\leng{Area}\lrus{Площадь}},
  symbol = {\si{\metre\squared}},
  type ={symbols}
}