# Math Help - Signs

1. ## ≡ Sign

I just need to know what this sign means:

If the symbol didn't show up, it is the three horizontal lines like the equal sign, but with 3 instead of 2 lines.

I'm studying Calculus by myself over the summer I need some help. :P

2. Originally Posted by iEricKim
I just need to know what this sign means:

If the symbol didn't show up, it is the three horizontal lines like the equal sign, but with 3 instead of 2 lines.

I'm studying Calculus by myself over the summer I need some help. :P
It can mean a few things

congruent

like

$x^2\equiv{1}\mod p$

Or it can mean defined

$\text{Let }f(x)\equiv{x}$

3. Ok. That is all I need to know for now. Thanks!