The vast majority of shapes. Common examples are scalene triangles, irregular quadrilaterals and n-gons of all number of sides.
However, because they are irregular, their characteristics are more difficult to measure. Consequently many are not studied at school.
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a pentagon has 5 lines of symmetry
An equilateral triangle has 3 lines of symmetry
A parallelogram.
A rectangle has exactly 2 lines of symmetry
Yes and its lines of symmetry are infinite