AHA!

To maybethemoon -

Thank you, you have my day. Holy crap.

Hey, guys? The symbol on Sirius's chest? It is "the coming together of the two opposing forces of the Sun and Moon."

Also, she says, "Positioned upside-down, it is also the symbol for 'amalgam,' which is the combination of mercury with another substance, preferably silver. Otherwise, it most closely resembles the sigil of Neptune.".

I think I am going to line up to also have Cuaron's babies. Dudes.

It's canon.

(Off to get up and go to work. With books. YAY!)