plane of symmetry

Reflective bisecting surface

A plane of symmetry is an imaginary flat surface that divides an object into two mirror-image halves.

Each point on one side has a corresponding point at equal distance on the other side: A butterfly has one plane of symmetry running down its body.

Objects may have multiple planes of symmetry—a cube has nine—or none at all.

Related

achiral · reflection · mirror image · left and right · bisector · twinning · axis · congruence · morphology · body plan · centroid · tessellation · mineralogy · morphogenesis · polymorphism · wave interference · structural analysis

Opposites
symmetry vs. asymmetry

plane of symmetryasymmetry

Absence of balanced form

irregular shape · chirality · handedness · enantiomer

type of symmetry element

plane of symmetryaxis of symmetry

Line dividing congruent halves

rotational axis · axis of rotation

Family

plane, planes, planed, planing, planar, biplane, airplane, aeroplane, symmetry

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