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4. !
In the programming world, this means NOT. It is mostly used in boolean expressions, mostly found in if statements, to express the non-equality of something.

It can be used with an '=' sign like this: 3 != 4, meaning 3 does not equal 4. This is a true expression, and so the expression would return TRUE. However, if I put: ((6-3) != (5-2)) I'm basically saying 6-3 is not equal to 5-2, or 3 does not equal 3. But 3 DOES equal 3. So this expression would return false.

NOTE: != is pronounced as "Does Not Equal"

This can also be used in dialog.
int main()
{
int john = 6;
int mary = 7;
if(john != mary)
{
printf("John does not equal Mary.\nJohn does equal %d, and Mary does equal %d.\nThere is %d between them.\n",john,mary,(john-mary));
}
}

John: "Hey, did you here that science dude say e = mc3?"
Mary: "Yeah man! e totally != mc3! (NOTE: ! at end of Mary's quote does not mean the same thing. Please refer to definition number 1 here !)"
by Apr 3, 2005 add a video
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 of 5
1. !
In the mathematical sense, it means factorial. The definition of factorial is as follows: n*(n-1)*(n-2)*(n-3)*(n-...), (n-1) > 0.
The factorial of 5 = 5*4*3*2*1 = 120.
by Jan 17, 2005 add a video
2. !
Suggests juxtaposition of two things; one of them is usually a person or character. The word preceeding the exclamation point is never something daily. It's always a costume or disguise or new personality or something.
Originated in the fanfiction community, specifically among the AU (alternate universe) crowd.
The best part about going to the rodeo was seeing Cowboy!Todd in his outfit.
I don't know what's been up with you lately, but Bitch!Lacey needs to be fragged.
by Jun 1, 2004 add a video
3. !
n. Symbol appearing (usually above one's head) when an unwelcomed outside party is seen.

When red, unwelcomed party will be pursued.

When yellow, odd noise or object will be investegated.
!
What was that sound?
!
I see him/her! It's the enemy!
by Feb 18, 2004 add a video
5. !
Often used in MGS as a sign that you've been spotted, or they've found the porn mag that placed on the floor
*Raiden puts the magazine on the floor as a soilder enters then room*

Gaurd: *!*
*He checks around*
Gaurd:Oooooh, yeaaah.
*He shakes*

by Jul 2, 2006 add a video
6. !
An onomotpoeiac symbol denoting a loud noise.
!