plural of aerospace plane

plural of doomsday plane

(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)

plural of supplementary plane

(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).

plural of median plane

plural of spy plane

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