- right conoid
- right edge
- right invariant
- right justify
- right module
- right parallelepiped
- right pyramid
- right shift
- right side
- right-adjusted
- right-hand
- rigid
- rigid body
- rigid continuum
- rigid frame
- rigid support
- rigid truss
- reverse blading
- reverse break
- reverse charging
- reverse find
- reverse image
- reverse indexing
- reverse printing
- reverse voltage
- reversed tension
- reversibility
- reversible counter
- reversible function
- reversing switchgroup
- reversion
- revision
- revision marks
- revolution window
- revolve
- rewind
- rewind time
- RGB monitor
- rheologic equation
- rhombohedral
- rib
- ribbon cartridge
- ring structure
- ring surface
- ring time
- ring topology
- ring-shaped
- rip track
- rise
- rise time
- rising characteristic
- risk analysis
- risk index
- river regulation
- retracting transformation
- retrieval
- retrieval function
- retrieval rate
- retrieve
- retroaction
- retrograde
- return address
- return code
- return jump
- return path
- return value
- returnable packaging
- returned value
- reusability
- reusable file
- reusable program
- reuse factor
- reversal
- reverse charge
- reverse order
- reverse search
- reverse video
- reversible process
- reversible relation
- revert
- revertive
- revolving deck
- rewind key
- RGB screen
- ribbon
- residual modulation
- residual noise
- residual oscillation
- residual set
- residual settlement
- resilience
- resist
- resize
- resolution chart
- resolution threshold
- resolvent set
- resolving power
- resonance effect
- resonant load
- resource allocation