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- Pass
- Pattern
- Pattern recognition
- Peak envelope power
- Peak envelope power (2)
- Peak load
- Peak pulse power (carrier frequency)
- Peak wind speed
- Peat
- Pentagonal cluster
- Percentage content (of solids)
- Percentage of Visibility
- Perception
- Performance monitor
- Period
- Period (of a rhythmic light)
- Period of a light
- Periodic duty
- Periodic quantity
- Permanent-magnet
- Permanent Light
- Permanent echo
- Permanent load
- Petrol (G.B.)
- Petrol engine
- Phantom target
- Phase
- Phase converter
- Phase deviation
- Phase meter
- Phase modulation (PM)
- Phase of a light
- Phase voltage (of a three-phase alternator)
- Phosphorescence
- Photo-electric switch
- Photoelectric Photometer
- Photoluminescence
- Photometer
- Photometry
- Photopic Vision
- Physical Photometer
- Pick-up factor
- Pick-up ratio
- Pickling
- Pier
- Pier (2)
- Pierhead
- Pigment
- Pile
- Pile cap
- Pile driving
- Pile helmet
- Piling
- Pilot Light
- Pilotage
- Piloting
- Pin
- Pin Cap (G.B.)
- Pipe
- Piston
- Piston ring
- Pitch
- Pitch (of a chain)
- Place of Refuge
- Plan position indicator
- Plane of polarization
- Plane polarized wave
- Plane wave
- Plank
- Plastic(s)
- Plasticity
- Plasticity index
- Plate
- Plate Glass
- Platform
- Play
- Plinth
- Plug (masonry)
- Plug (top)
- Plywood
- Pneumatic relay
- Point Brilliance
- Point Vision
- Point source
- Point visibility meter
- Pointing
- Poisson's ratio
- Polarisation (of an electrochemical cell)
- Polarization
- Polarization error
- Polarized relay
- Pole Beacon
- Polychromatic radiation
- Polymer
- Pontoon
- Population
- Port Hand Mark (or Buoy)
- Portal frame
- Position control system
- Position determination
- Position fixing
- Position line
- Position line (2)
- Position of rest
- Positive feedback
- Post
- Potential annual energy output (of a wind-power generator)
- Potentiometer
- Power
- Power curve (of a wind-power generator)
- Power gain - antenna
- Power line
- Power pack
- Power system
- Pre-Focus Cap
- Pre-Focus Lamp
- Pre-emphasis
- Pre-ignition
- Precast concrete
- Precision
- Predrilled
- Prefabricated
- Preservation
- Pressure
- Pressure-reducing valve
- Pressure-relief valve
- Pressure reducing valve
- Pressure stat
- Prestressing
- Preventive maintenance
- Pricking Out
- Primary Light Source
- Primary cell
- Primary radar
- Prime mover
- Primer
- Principal axis
- Prism
- Prismatic Lens
- Prismatic Section
- Profile (of a fixed lens)
- Profile (of a lens, other than a fixed lens)
- Progressive wave
- Projector
- Projector Lamp (G.B.)
- Propagation error
- Propane
- Proportional action
- Proportional plus derivative action
- Proportional plus integral action
- Proportional plus integral plus derivative action
- Protected enclosure (or machine)
- Protected machine
- Protection
- Pseudolite (pseudo-satellite)
- Pulse
- Pulse-modulated radar
- Pulse amplitude modulation (PAM)
- Pulse code modulation (PCM)
- Pulse droop
- Pulse duration
- Pulse duration coding
- Pulse duration modulation (PDM)
- Pulse duty factor
- Pulse forming line
- Pulse frequency modulation
- Pulse modulation (by pulses)
- Pulse modulation (of pulses)
- Pulse position modulation (PPM)
- Pulse power
- Pulse repetition frequency
- Pulse repetition frequency (PRF)
- Pulse repetition rate
- Pulse repetition rate (PRR)
- Pulse rise time
- Pulse spacing
- Pulse spike
- Pulse tilt
- Pulse time modulation (PTM)
- Pulse train
- Punching
- Pure sound
- Purkinje Phenomenon
- Purlin
- Push-button (switch)
- Qualification
- Qualification (AtoN)
- Quality Management System (QMS)
- Quantity of Light
- Quantization
- Quantization distortion
- Quantization error
- Quantizer
- Quarantine (Ground) Mark (or Buoy)
- Quarter wave skirt dipole
- Quay
- Quay (2)
- Quick-Flashing Light
- Quick lime
- Quiescent Load
- R.F. head
- R.F. stage
- Rack
- Racon
- Radar
- Radar beacon
- Radar echo
- Radar equation
- Radar head
- Radar performance figure
- Radar reflector
- Radar reflector response pattern
- Radar relay system
- Radar repeater
- Radar target
- Radial Screens
- Radiance
- Radiant energy
- Radiant exitance
- Radiant exposure
- Radiant intensity
- Radiant power
- Radiation
- Radiation efficiency
- Radiation field
- Radiation intensity
- Radiation monitor
- Radiation pattern
- Radio
- Radio-isotope generator
- Radio Lens
- Radio beacon - Continuous carrier
- Radio beacon - Dual carrier
- Radio beacon - Non-Directional
- Radio beacon characteristic
- Radio beacon range
- Radio beacon station
- Radio determination
- Radio horizon
- Radio leading line
- Radio receiver
- Radio telemetry
- Radio transmitter
- Radio waves
- Radiodetermination
- Radiogoniometer
- Radiolocation
- Radionavigation
- Rafter
- Rain clutter
- Rake (of a pile)
- Raking pile
- Ramark
- Ramp
- Rana system
- Random access
- Random access memory
- Random error
- Random error (2)
- Random triggering
- Range marker
- Range rings
- Ratan
- Rated Life (of a lamp)
- Rated power output
- Rated wind speed (of a wind-power generator)
- Rating
- Rating (of a machine or apparatus)
- Raydist
- Raydist Lane resolution
- Raydist Relay station
- Re-entrant horn
- Re-radiation
- Re-radiation error
- Reaction
- Reactor-start motor
- Ready-mixed concrete
- Real time
- Real time processing
- Reaming
- Rear Light
- Rebate
- Rebuilding
- Receiver radiation
- Reciprocating (air) compressor
- Reciprocating engine
- Recognition of an AtoN Light
- Recognition of prior learning (RPL)
- Recombination
- Reconstruction
- Record
- Record (2)
- Recorder
- Recording
- Recording equipment
- Rectifier
- Recurrent training
- Red lead primer
- Reduced carrier
- Redundancy
- Redundancy (2)
- Reed
- Reed box
- Reed fog signal
- Reed holder
- Reef
- Reference frequency
- Reference input signal
- Reflectance
- Reflection
- Reflector
- Reflector (2)
- Reflector Lamp
- Refraction
- Refraction (2)
- Refractive Index
- Refractive index
- Refractive modulus
- Refractor
- Refresher Training
- Refurbishment
- Refusal
- Register
- Register (2)
- Regular Transmission
- Regulator
- Reinforced concrete
- Reinforcement
- Reinforcing Mirror
- Reinforcing bar
- Relative display
- Relative gain of an antenna
- Relay
- Reliability
- Reliability (of a position fix)
- Reliability (of an observation)
- Relief
- Relief davit
- Remote control
- Remote learning
- Remotely Controlled Light
- Rendering
- Renovation
- Repair
- Repeatability