Athiest

ATHIEST -  When American Atheists (AA) was founded in 1963, they chose the atomic symbol as seen in the center of the above graphic as their logo. The use of the atomic symbol flowed from their belief that human progress can best be achieved through the scientific method and rational, open inquiry.

Some of the features of this symbol:

• The lower part of the symbol is broken or open ended. This refers to the incompleteness that is inherent in the science. As AA's web site says: "Not all of the answers are in."
• The incomplete vertical electron orbit forms the letter "A" which represents Atheism.
• The letter "A" in the center of the symbol does not represent Atheism. It stands for the first letter of the name of the country where an AA affiliate group is located -- America in this case. 

Unfortunately, many people associate this symbol with danger, nuclear waste, hazardous radiation, nuclear bombs, etc.  It has not found general acceptance.