1. Cultural
In different cultures there obviously will be different interpretations and feelings associated with certain colors and symbols. Example being, in Western culture green is a color associated with money and envy, and in Chinese when a man wears a green hat it mean their wife has cheated on them.
2. Natural Symbols
These symbols are easily understood beyond language barriers such as trees for nature and fire as heat or danger.
3. Color
Color can mean different things when it comes to different cultures. For example, the color white in Western culture means purity, peace and cleanliness. Meanwhile in Eastern and Asian culture the color white means death, and used as a color for funerals while also having the meaning of purity.