Answered my own question :

"Atheist Day Symbol
The symbol of a green circle is two-fold in meaning: The shape of a circle is one of the oldest atheist symbols. It represents symmetry, peace, and harmony. The circle is akin to a zero, symbolizing the null, the lack of, or absence of a belief in a god, i.e., godlessness."

What is that symbol?

Did a quick check. Does this includes agnostics? (You know how they can be). I found it's for atheists and 'supporters'. Wonder if that means agnostics or if they see it like that. Couldn't find a reference to the symbol.

It's about damn time we got our own holiday. SInce, most of the religious are bs.

We have two holidays. Atheist Day March 23 and National Day of Reason this year May 6, first Thursday in May, a day after the stupid day of prayer.

I can't wait so happy atheist day early.

And wishing you a happy day too.