A noted lecturer once presented his audience with a white sheet of paper that had a black dot in the center. He asked the crowd what they saw. Without exception they responded,
A black dot. He asked: “Why do you choose to focus on the insignificant speck of black in the middle of a page, when its overwhelming majority contains white space?”
Interesting, isn’t it?
A dot might seem to be an unassuming little thing, the first mark on the pristine sheet of paper. In this case, the dot is a beginning. But see what just happened there? The dot, an essential component in the structure of the sentence, closed it, making it a symbol of ending. Therefore, the dot is both an origination and a conclusion, encompassing all the possibilities of the Universe within it, a seed full of potential and a symbol of the Supreme Being. The dot is the point of creation, for example, the place where the arms of the cross intersect.
The dot is also called the bindi, which means “drop.” The bindi is a symbol of the Absolute, marked on the forehead at the position of the third eye in the place believed to be the seat of the soul.
The presence of dots within a symbol can signify the presence of something else. A dot in the center of the Star of David marks the quintessence, or Fifth Element. It also acts as reminder of the concept of space. The decorated dots that surround the doorways of Eastern temples are not merely ornamental devices but have significance relevant to the worshipers. Dots frequently appear in this way, acting as a sort of shorthand for the tenets of a faith.
In the Jain symbol, for example, the dots stand for the Three Jewels of Jainism. The dots in each half of the yin yang symbol unify the two halves: one dot is “yin,” the other “yang.” Together they demonstrate the interdependence of opposing forces.
Source: Encyclopedia of Secret Signs and Symbols