- resource deallocation
- resource label
- resource manager
- resource record
- resource type
- responder
- response confirmation
- response error
- response lag
- response PDU
- responsible party
- restart point
- restorer pulses
- restoring completion
- restrictedly convergent
- restrictive
- restructuring
- resulting indicator
- resume
- retail services
- retail terminal
- retarded
- retort
- retrieval command
- retrieval system
- retrieving
- retry
- return
- return instruction
- return period
- rim compact
- ring accumulator
- ring counter
- ring domain
- ring indicator
- ring modulator
- ring module
- ring network
- ring shift
- ring-like
- ringoid
- risc
- risk
- RJE
- RJE operator
- RMI
- RMS error
- revenue
- reverse
- reverse engineering
- reverse indention
- reverse reading
- reversible transformation
- review file
- revised version
- revision management
- rewind control
- RGB system
- rheonoous constraint
- rhombohedron
- ribbed arch
- ribbon carriage
- Riemann surface
- Riemannian geometry
- right brace
- right factorization
- right inverse
- right justification
- right parenthesis
- right section
- right-align
- right-aligned
- right-click
- road roller
- road rooter
- roaming
- robot
- robot arm
- robot system
- robotics
- robotrobotics
- robust
- robust criterion
- robust program
- robustness
- rock sheet
- rocker
- rocker arm
- rocker bearing
- rod
- rod foot
- rod test
- role indicator
- roll
- roll back
- roll in
- roll out
- roll paper
- Rolle Michel
- roller track