r
- radio button
- radio frequency
- radio frequency identification
- radio frequency interference
- RAID
- rail-switcher
- rainbow series
- RAM
- RAMDAC
- random
- random access
- random access memory
- Random Access Memory Digital-to-Analog Converter
- Range
- rarefaction
- raster
- raster graphics
- raster image processor
- rasterize
- ray tracer
- RCA connector
- RCA phono jack
- R-DAT
- reactance
- read-only memory
- Real answer
- RealAudio
- Realization
- RealMedia
- realtime
- realtime counter
- Realtime Streaming Protocol
- Realtime Transfer Protocol
- reboot
- receiver
- Reciting tone
- recompress
- reconstruction filter
- record
- Recording Industry Association of America
- rectifier
- Rectus
- recursive
- Red Book for PostScript
- Red Book standard
- red-green-blue
- redundancy
- redundant arrays of independent disks
- Reed-Solomon Code
- reference level
- reference noise
- reflected light
- reflector
- refresh rate
- regular expression
- relational database
- Relative keys
- relative path
- relay
- remote control
- remote production unit
- Renaissance period
- render
- repeater
- replicate
- request
- Request For Comments
- resistance
- resolution
- resource fork
- Response
- Responsory
- Retardation
- Retrograde
- Retrograde inversion
- reverb
- reverberation time
- reverse engineering
- RF
- RFC
- RFI
- RFID
- RGB
- rheostat
- Rhythm
- Rhythm and Blues
- RIAA
- RIAA equalization curve
- Ricercar
- Rich Text Format
- Rider
- Ritard
- Ritornello
- RMS
- roaming
- robot
- Rock Ridge Format
- roll
- roll-off
- ROM
- Romanesca
- Romantic period
- Rondo form
- Root
- root directory
- Root Mean Squared
- rotating digital audio tape
- rotational latency
- rough cut
- Round
- Rounded binary
- router
- Routing Information Protocol
- Royalty
- RS
- RTF
- RTP
- RTSP
- rule of thirds
- runtime code