plan - poly
- plan shear indicator
- plan-position indicator
- Planck function
- Planck's constant
- Planck's law
- Planck's radiation law
- Planckian radiator
- plane atmospheric wave
- plane of the ecliptic
- plane polarization
- plane source
- plane wave
- plane wave pulse
- plane-dendritic crystal
- plane-parallel approximation
- plane-parallel atmosphere
- plane-parallel medium
- planet
- planetary albedo
- planetary atmosphere
- planetary boundary layer
- planetary circulation
- planetary equilibrium temperature
- planetary motion
- planetary scale
- planetary temperature
- planetary vorticity
- planetary vorticity effect
- planetary vorticity gradient
- planetary wave
- planetary wind
- planetary wind belt
- planetary-gravity wave
- planetary-scale system
- planetary-wave formula
- planetesimal hypothesis
- planetoid
- planimeter
- plant canopy
- plant climate
