- planer safety
- planer tool
- plane section
- plane-separation axiom
- plane [shock] wave generator
- plane shock wave generator
- plane source
- plane strain
- plane strain fracture toughness
- plane subsystem
- plane sundial
- plane surface
- plane surface system
- plane symmetry
- planet
- planet aberration
- planet aberration, planetary aberration
- plane table
- plane-table equipment
- plane table surveying
- plane-table traverse
- Planet-A probe
- planetaria
- planetarium
- planetarium software