People that send e-mail, instant messages or lines in a chat room sometimes use a language that is not found anywhere else.
There are abbreviations, to say something in less time than it would take to type it. A famous example is LOL (laughing out loud). After somebody writes a very funny sentence you can simply respond with LOL.

For a more graphic display of your emotions, there are emoticons. These are expressions to show how you feel, such as smiley faces (look at them sideways).

Emoticons

Smiley	`:-)`
No-nose Smiley	`:)`
Bug-Eyed Smiley	`8^]`
Crying Smiley	`:'-(`
Grimacing Smiley	`>:-(`
Neat Smiley in Profile	`{:^)`
Punk Rock Smiley	`=:)`
Scowling Smiley	`:-/`
Shocked Smiley	`:-O`
Smiley in Profile	`:^)`
Snubbed-Nose Smiley	`:+(`
Tongue Out Smiley	`:-P`
Unhappy Smiley	`:-(`
Very Neat Smiley	`{:-D`
Very Smiley	`:-D`
Very Unhappy Smiley	`(:^(`
Winking Smiley	`;-)`
Wry Winking Smiley	`;-`

Abbreviations

<bg>	Big grin
<g> or <G>	Grin
BCNU	Be Seeing You
BTW	By the way
DLG	Devilish Little Grin
FAQ	Frequently Asked Questions
FOTCL	Falling Off The Chair Laughing
FWIW	For What It's Worth
FYA	For Your Amusement
FYI	For Your Information
IMHO	In My Humble Opinion
IMNSHO	In My Not So Humble Opinion
IMO	In My Opinion
KISS	Keep It Simple Stupid
LOL	Laughing Out Loud
OTF	On the floor. Short form of ROTFL.
OTOH	On The Other Hand
PD	Public Domain
ROTFL	Rolling On The Floor Laughing
RTFM	Read The Fine Manual. Used when a stupid question is asked.
TIA	Thank In Advance
TNX	Thanks
TNX 1.0E6	Thanks a million (humorous)