Infinite
An octahedron has 7 perpendicular lines.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Several of these may be considered as octahedron cone and the answer depends on which particular shape you have in mind.
It need not have any.
it has five lines of symmetry
A nephroid has 2 lines of symmetry.
10 lines of symmetry
4 Lines of symmetry
2 lines of symmetry
2 lines OF SYMMETRY
2 lines of symmetry
It has 2 lines of symmetry.