(nautical) A moveable control surface on a submarine, used to control the depth and pitch of the submarine.

(nautical) A diving plane mounted on or near the sail of a submarine, used to cause the submarine to rise or sink without pitching up or down.

(nautical) A diving plane mounted on or near the bow of a submarine.

(nautical) A diving plane mounted on or near the stern of a submarine.

clipping of paper airplane. / clipping of paper aeroplane.

Alternative spelling of bitplane

Alternative form of planetree / (mathematics) An ordered tree, a type of graph, in which the child nodes of each vertex have a definite number assigned.

Alternative form of spyplane

(astronomy) The plane that passes through the Earth's equator, or by extension the equators of other celestial bodies.

(astronomy) The ecliptic, the plane of the Earth's orbit around the Sun, or by extension the orbital planes of other celestial bodies.