Symmetry generally means a use of proportion, balance, or patterned self-similarity. The most familiar type of symmetry to most people is in geometry. Mirror symmetry (like in the picture of the week) is symmetry that is reflected on an axis. Another way of thinking would be that if the picture were folded over an axis, the two halves would look identical. Isosceles triangles, quadrilaterals, and isosceles trapezoids are shapes with symmetry.

-Kristin