# What symbol is this?

1. Jun 10, 2007

### n0_3sc

What symbol is this??

What does this mean " $$\vdots$$ "

I don't what its called so I couldn't google it...Its to do with Susceptibility and Electric Field.

2. Jun 10, 2007

### n0_3sc

(The symbol inside the quotation marks)

3. Jun 11, 2007

### ijustlost

What context was it used in? Might be clearer if you put down the whole equation / sentance it's used in..

4. Jun 11, 2007

### n0_3sc

Its used like this:

$$\overline{P} = \epsilon\chi^{(2)}\vdots\overline{E}$$

(In relation to polarization and susceptibility of an EM wave)