circle-A

Etymology
An overstruck 'A' and 'O' (whether the 'A' is enclosed in the 'O' or extends beyond it). The symbol is an acronym of the slogan "Anarchy is Order", coined by French anarchist Pierre-Joseph Proudhon. It is now commonly interpreted as an 'A' in a circle.

Noun

 * 1) Ⓐ; The symbol of anarchism