Reflection Symmetry: A type of symmetry where one half ... used to encode rotations in three-dimensional space. This Nature Research Intelligence Topic summary is one of 30,000 created with ...

A 2D shape is symmetrical if you can draw a line through the middle of it and either side is a reflection of the other. There is a very famous example of symmetry in nature - the butterfly.

And it's so good to be in all this nature because it's so ... something and the two sides are a reflection of each other, you have found the line of symmetry, or the mirror line.