plane figure
two-dimensional figure
concave polygon
convex polygon
decagon
dodecagon
heptagon
hexagon
isogon
nonagon
octagon
pentagon
quadrangle
quadrilateral
spherical polygon
tetragon
triangle
trigon
trilateral
undecagon
polygonal
lunette
p&p
parallelogram
polyline
powershell
semicircle
tetrahedron
trapezoid