There is only one line of symmetry in an isosceles triangle. If you draw this triangle with the "odd" side as the base and then bisect it with a vertical line, you will have that one line of symmetry. The triangle can be folded in half along this line because each side is a mirror of the other.
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An equilateral triangle has 3 lines of symmetry
3 is how many lines of symmetry a triangle has.
It has 3 lines of symmetry
In general, a triangle can have 0, 1 or 3 lines of symmetry.
That depends on what type of triangle it is because an equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has only 1 line of symmetry and any other triangles have no lines of symmetry.