- rolling mill
- ROM card
- root
- root module
- rollback
- rolled iron
- roller ball
- roller stamp
- rolling ball
- ROM emulator
- roman cipher
- root mode
- rooter
- Rotate Left
- Rotate Right
- rotated type
- rotating data
- rotation group
- rotation values
- rotational field
- rough draft
- rough sketch
- roulette
- round
- rolling
- rolling center
- rollover
- rollover menu
- ROM cartridge
- ROM simulator
- roman
- roman letter
- roman numerals
- romex connector
- roof arch
- root location
- root record
- root test
- root window
- rooted
- rose curve
- rotary dial
- rotary ratchet
- rotary switch
- rotate
- rotor
- rough timber
- round bracket
- route calls
- route menu
- router
- routine name
- routing
- routing decision
- routing information
- routing selection
- routing step
- row address
- row constraint
- row headings
- runtime mode
- rupture test
- S3
- SAA environment
- saddle-shaped
- safe format
- safeguard
- safety fuse
- safety rail
- safety service
- round figures
- rounded particle
- rounding circuit
- route extension
- route set
- routine
- routine slip
- routing affinity
- routing application
- routing control
- routing data
- routing discovery
- routing file
- routing indicator
- routing list
- routing page
- routing pattern
- routing queue
- routing slips
- routing table
- row
- row binary
- row field
- row height
- row matrix
- row order
- row vector
- RPL string
- RS-232D
- RTAM generation