One type of symetry is rotation symetry.
it has no lines of symetry
circle
a rhombus has no lines of symetry
It has no lines of symetry at all.
2 lines of Symetry
A regular octogan has 8 lines of symetry, and a irregular octogan has 2 lines of symetry.
A line has two fold rotational symetry.
A circle has an infinite amount of lines of symetry.
An equilateral triangle
how many lines of symetry does the letter R have
I would say it is asymmetrican, not radial or bilateral.