If the symbol of lucid dreaming is a moon, what would astral projection be?

[Jdeadevil]

I'm just asking this because I have this that I found on Google, on my wall:

http://sd.keepcalm-o-matic.co.uk/i/keep-calm-and-lucid-dream-4.png

And I wanted one for astral projection so I can have it side by side to contrast, maybe have a light background too. So I was wondering if there was an official symbol or anything.

[Xanth]

Pick whatever you want.  It'll be as official as your "moon" for LDing.