Ways to let other know you are poly?

[MusicalRose]

I've seen this image used a lot as a symbol of polyamory:

http://www.awesomeyourlife.com/wp-c...preneurship-sacred-economy-joy-revolution.jpg

That sign in your link is more typically associated with relationship anarchy. It's different from poly, but the two are associated quite a bit. The infinity heart is the one I see far more often.