Symbolism is also used for more practical purposes. Roman numerals, musical notations, religious icons are all examples of symbology that are used by us everyday. We use them in artwork, in writing, music, movies, and a lot of other things. For example, every color is associated with an emotion, like red with anger and green with envy. Symbols can be used to identify a concept, it can be used to express facts that cannot have physical representations. They can represent unknown facts and be used to convey hidden and deeper meanings.