(all wikipedia links)
The circled dot, circumpunct, or circle with a point at its centre is an ancient symbol. It can symbolize:
- The sun: See also Solar symbol
- A vector directed out of and orthogonal to the two-dimensional surface on which it is drawn (as opposed to indicating a vector which is orthogonal and directed inwards with respect to the same surface; the two are antiparallel).
- The circumference of a circle
- An Ordi, the symbol of the Divine Order, representing Chaos, Light, Life, Freedom, Good, Happiness, Infinity, and Existence
- Gold (Alchemy)
- Control of the passions (Freemasonry)
- City centre (European road-signs)
- Make a wish (reading tea-leaves)
- Determined position (navigation)
- The eye of God (early Christian)
- End of trail. Gone home. (Scouting)
- Spirit (Chippewa Indian)
- Cup (Robert Shumaker’s Orangutan symbol language), 
- In phonology, a click consonant
- The trademark of the Target Corporation
- The Huichol Indian’s Eye of God “Ojo de dios”.
- Can depict a stylized representation of an atom of hydrogen, the oldest, simplest and most abundant chemical element in the universe. (Fittingly, as hydrogen makes up most of the mass of the Sun, also represented by a circled dot.) As such, this symbol adorns the forehead of the fictional character Doctor Manhattan.
- Kether in Sephirot (Kabbalah)
- Monad in Pythagoreanism