Optical field question (very easy)

[Hypnotoad]

When an optical field is written as:

$$E=A_1e^{i(\vec{k}\vec{r}-\omega t)}+A_2e^{i(\vec{k}\vec{r}-\omega t)}+c.c$$

what does the c.c. for?

 

[Tide]

That would be the complex conjugate.