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	Eng ID	Term	Definition
	3881	pingo	Small conical hills having a large central core of ice formed from the encroachment of permafrost and the resulting hydrostatic pressure.
	3882	pingo-like features (PLF)	Small conical undersea features having the geomorphological appearance of pingos.
	3883	pinnacle	Any high tower or spire-shaped pillar of rock or coral, alone or cresting a SUMMIT. It may extend above the surface of the water. It may or ... more Any high tower or spire-shaped pillar of rock or coral, alone or cresting a SUMMIT. It may extend above the surface of the water. It may or may not be a hazard to SURFACE NAVIGATION.
	3884	pinnacled iceberg	An iceberg weathered in such manner as to produce spires or pinnacles. Also called pyramidal iceberg, irregular iceberg.
	3885	pinpoint	(v.t. and i.). To establish (POSITION) with great ACCURACY.
	3886	pip	See BLIP.
	3887	pipe	A hollow metal tube, of varying diameters and lengths, imbedded in the bottom in a manner similar to a pile. Pipes are often used as private... more A hollow metal tube, of varying diameters and lengths, imbedded in the bottom in a manner similar to a pile. Pipes are often used as privately maintained aids to navigation and in the determination of beach or bottom sand migration (deposition or erosion).
	3888	pipeline	A string of interconnected pipes used for the transport of matter, nowadays mainly oil or gas .
	3889	pitch	The oscillations of a ship about the transverse axis, due to the bow and stern being raised or lowered on passing through successive crests ... more The oscillations of a ship about the transverse axis, due to the bow and stern being raised or lowered on passing through successive crests and troughs of waves. Also called pitching. The distance along the axis of a screw or other helix between consecutive threads or ribs. The distance a propeller would advance longitudinally, in one revolution if there were no slip.
	3890	pitching	See PITCH.
	3891	pivot	A spindle or pin by which a movable part of an instrument is supported so as to be free to turn. The pivot of a COMPASS is usually a fixed p... more A spindle or pin by which a movable part of an instrument is supported so as to be free to turn. The pivot of a COMPASS is usually a fixed point on which the NEEDLE hangs by a single jewelled cap.
	3892	pivot point	After a ship has assumed its DRIFT ANGLE in a turn, the point on the centerline between the bow and the CENTRE OF GRAVITY at which the resul... more After a ship has assumed its DRIFT ANGLE in a turn, the point on the centerline between the bow and the CENTRE OF GRAVITY at which the resultant of the velocities of rotation and transaction is directed along the centerline. To an observer on board, the ship appears to rotate about this point.
	3893	pixel	Contraction for "picture element". The smallest element resolvable by electronic raster devices such as SCANNER, DISPLAY, and PLOTTER. See R... more Contraction for "picture element". The smallest element resolvable by electronic raster devices such as SCANNER, DISPLAY, and PLOTTER. See REMOTE SENSING.
	3894	plain	Any LAND with a flat or very slightly undulating surface. A flat, gently sloping or nearly level region of the SEAFLOOR, for example, ABYSS... more Any LAND with a flat or very slightly undulating surface. A flat, gently sloping or nearly level region of the SEAFLOOR, for example, ABYSSAL PLAIN.
	3895	plan	An orthographic drawing on a horizontal plane, as of an instrument, a horizontal section, or a layout. A large scale map or chart of a smal... more An orthographic drawing on a horizontal plane, as of an instrument, a horizontal section, or a layout. A large scale map or chart of a small area.
	3896	plane: horizontal	A plane perpendicular to the DIRECTION OF GRAVITY; any plane tangent to the GEOID or parallel to such a plane. In SURVEYING, a plane perpen... more A plane perpendicular to the DIRECTION OF GRAVITY; any plane tangent to the GEOID or parallel to such a plane. In SURVEYING, a plane perpendicular to the PLUMB LINE within which or on which angles and distances are observed.
	3897	plane: vertical	Any plane passing through a point on the EARTH and containing the ZENITH and NADIR of that point. In SURVEYING, a plane at right angles to a... more Any plane passing through a point on the EARTH and containing the ZENITH and NADIR of that point. In SURVEYING, a plane at right angles to a HORIZONTAL PLANE and within which angles and distances are observed.
	3898	plane coordinates	See COORDINATES: PLANE RECTANGULAR.
	3899	plane rectangular coordinates	See COORDINATES.
	3900	plane sailing	See SAILING.
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