| | aka | | Red |
| | CCCP | | Russian initialism for former U.S.S.R.(cyrillic) |
| | DVDR | | Recordable Digital Video Disc |
| | oap | | retired person |
| | qvga | | represents 320x240 |
| | qvga | | represents 320x240 pixels |
| | r&b | | Rhythm and Blues |
| | R&D | | research & development |
| | R&D | | research and development |
| | R.A.I.D. | | Redundant array of inexpensive disks |
| | R.E.D. | | Random Early Detection |
| | R.I.C.E. | | Rest, Ice, Compression and Elevation |
| | r.i.p. | | Relief In Place |
| | r.i.p. | | rest in peace |
| | r.o.t.f.l. | | rolling on the floor laughing |
| | r.o.w. | | Right Of Way |
| | r.s.v.p. | | respond after receiving |
| | R.T. | | radio telephone |
| | R.T.C. | | real time clock |
| | R.T.G. | | real time gaming |
| | R.Y.G.B. | | Red, Yellow, Green, Black |
| | R.Y.G.B. | | Roux-en-Y gastric bypass |
| | r/w | | read/write |
| | RACI | | Responsible, Accountable, Consulted and Informed |
| | RADAR | | Radio Detection And Ranging |
| | RAEW | | Responsibility, Authority, Expertise and Work |
| | RAFO | | Research & Find Out |
| | raid | | redundant array of inexpensive disks |
| | raid | | redundant arrays of inexpensive disks |
| | RAV | | Recreational Active Vehicle |
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