Symmetry
The ability to be rotated or flipped and appear the the exact same way it was before the rotate or flip. There are three types of symmetry:
 Symmetry on a center Point (figure 1)  Will retain the same shape even if flipped over both the x and y axes. Can be rotated 90° and will still retain the same shape.
 Symmetry on the x axis (figure 2)  Will retain the same shape if flipped over the the x axis.
 Symmetry on the y axis (figure 3)  Will retain the same shape if flipped over the the y axis.
See also Axis of symmetry.

Figure 1: Symmetry on a Center Point
Figure 2: Symmetry on the X Axis
Figure 3: Symmetry on the Y Axis
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