Also called "mirror symmetry", this is a type of symmetry in which two parts an object are mirror images of each other. The most common version of this is bilateral symmetry, which is (more or less) exhibited by people and other vertebrates, as well as most insects. Other types of reflection symmetry are possible; for example, images seen in a typical kaleidoscope will have the sort of symmetry that would be produced by three intersecting mirrors.

Here are some figures that demonstrate reflection symmetry:

-/            \-

\    /
 \  /
 /  \
/    \
The first one shows symmetry around only one plane (a vertical one), but the second shows symmetry around two planes, one vertical and one horizontal.

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