A concave-soled plane used in making beads.

(graph theory) An embedding of a planar graph in a plane.

(projective geometry) The plane onto which an object is projected in a parallel or perspective projection

(rare) Fear of planes, especially fear of air-travel on planes.

Synonym of spaceplane

(informal) An aircraft to be used as an airborne command post in the event of nuclear war or similar large-scale disaster.

(mathematics) A two-dimensional vector field of the phase between two variables

(geometry) A planene about which a geometric figure is symmetric (by reflection)

(computing) Any of the 16 Unicode planes located above Plane 0 (the BMP) and requiring the use of surrogate pairs to encode in UTF-16 (Planes 1 through 16, collectively covering the range of code points from U+10000 through U+10FFFF).

(astronomy) The orbital plane passing through a planetary system's barycenter (center of mass) perpendicular to its angular momentum vector.