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What are the shapes with countless symmetry axes?
1. Countless symmetry axis figures: circles, concentric circles, straight lines, etc.

2. Axisymmetric figure: mathematical term, defined as a figure folded along a straight line in a plane, and the parts on both sides of the straight line can completely overlap;

3. The straight line is called the symmetry axis, and the symmetry axis is represented by the dotted line;

4. The symmetry axis is a straight line;

5. In an axisymmetric figure, the distance between the corresponding points on both sides of the axis of symmetry is equal;

6. Axisymmetric graphics, folded in half along the axis of symmetry, completely overlapping left and right;

7. If two figures are symmetrical about a straight line, then this straight line is the line segment whose symmetry axis bisects the symmetry point vertically;

8. Graphic symmetry.