Whats the circle with backslash symbol mean?

[im_to_hyper]

Hey... anyone know what the circle with a backslash symbol in it means when attempting to boot from CD-ROM?

It reminds me personally of the European "No parking" sign.

I posted it yesterday but it was buried within another post...

 

[dsharits]

It means that the computer can't boot from that volume. Usually you'll see it when you try to boot from a corrupted OS installation.