| brb | Be right back. |
| btw | By the way. |
| fwiw | For what it's worth. |
| iow | In other words. |
| imho | In my humble opinion. |
| imnsho | In my not so humble opinion. |
| lol | Laughing out loud. |
| rotfl | Rolling on the floor laughing. |
| rtfm | Read the f...ing manual. |
| ttfn | Ta-ta for now. |
| ttyl | Talk to you later. |
Some abbreviations are used to convey emotions, often at the end of sentences:
| <grin> | Grin |
| <bg> | Big Grin |
| <vbg> | Very big grin. |