Rules for Rabbit Plug-in

Hi,

I'm currently trying to understand all the symbols or the rules of how Rabbit works to create a hilbert curve.

I know that F means moving forward, ' -' and '+' is turn left and right etc.

But what does the '&' and 'C' and '^' do?

Are there more types of rules i can apply to it to make it do other types of stuff like maybe turn 45 degrees instead of 90?


Thanks.
Sherm.