The Jewish Star, known as the Star of David, is a six-pointed star formed by two superimposed equilateral triangles. (see link.) A five-pointed star in a circle has a number of different meanings. It is used widely throughout the U.S. with many variations, as a representation of law enforcement, particularly in the Southwest U.S. (see link.) The five-pointed star formed by interwoven lines of equal length, within a circle, can also represent the nature religion, Wicca. The five sides of the star represent the five sacred elements of earth, air, water, fire and spirit. (see link) A five-pointed star, often with one point larger than the others, pointing downward, is also associated with Satanism. (see link.) Ironically, the same five-pointed star, with one long point directed downward, is used in Christian art as the Star of Bethlehem, pointing the way toward the Christ Child. (see link.)
It is a symbol used by recovering alcoholics, the three points represent the 3 parts of the disease, the circle means perfection.
If it is not a complete circle, but a partial circle around an upper-case "A", similar to the partial circle around a lower-case "a" that comprises the symbol @, then it may represent atheist or atheism. In this usage, it is often depicted in red.
You may mean the symbol for male, if so then the symbol for female is a circle patch with a cross.
The Astronomic symbol for the Earth is a circle with a cross in the center of it.There is an example on this website:http://en.wikipedia.org/wiki/File:Earth_symbol.svg
OU (U with the circle around it) is a reputable assocciation who checks to see if a brand is kosher
A c with a circle around it is the 'copyright' symbol.
The symbol commonly used for baby is a circle with two small lines above it to represent eyes and a larger line beneath it to represent a mouth - resembling a simple smiley face.
It is a big circle with a circle around it
It is the electrical symbol for an Ammeter (a device that measures current).
The symbol for Venus (circle over a cross) is used to represent females in general. The symbol represents the uterus and ovaries.
Usually a circle with a star in it. Although on some maps it may be a circle with a dot in it.
The most common symbol for the sun is a circle with a dot in the center. This symbol represents the sun's radiant energy and life-giving properties. It is a universal symbol found in various cultures and religions around the world.