See also: Enclosed A
The Circle-A is almost certainly the best-known present-day symbol for anarchy. It is a monogram that consists of the capital letter "A" surrounded by the capital letter "O". The letter "A" is derived from the first letter of "anarchy" or "anarchism" in most European languages and is the same in both Latin and Cyrillic scripts. The "O" stands for order. Together they stand for "Anarchy is the mother of Order," the first part of a Proudhon quotation. This character can be written as Unicode codepoint U+24B6: Ⓐ. In addition, the "@" sign or "(A)" can be used to quickly represent the circle-A on a computer.
Read more about this topic: Anarchist Symbolism