Chemistry
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| REHI | Hello Again | - | Chemistry |
| RFD | Request For Discussion | - | Chemistry |
| ROTFL | Rolling On The Floor Laughing (also ROFL) | - | Chemistry |
| ROTFLMAO | Roll On The Floor Laughing My A** Off | - | Chemistry |
| RSN | Real Soon Now | - | Chemistry |
| RTFM | Read The Foobaring Manual | - | Chemistry |
| RUOK | Are You OK? | - | Chemistry |