1, axisymmetric: If a graph is folded in half along a straight line and the two parts completely overlap, such a graph is called an axisymmetric graph, and this straight line is called an axis of symmetry. At this time, we also say that these two figures are symmetrical about this line, such as circles and squares.

2. Central symmetry: If a graph can overlap with another graph after rotating 180 degrees around a certain point, then we say that these two graphs form central symmetry, such as rectangle, diamond, square, circle, etc.

Note: Axial symmetry and central symmetry refer to one figure (graphic feature), while axial symmetry and central symmetry refer to two figures (positional relationship).