By tradition, Orange combines red, the symbol of pure energy, with yellow, the symbol of happiness. This creates an association with joy and sunshine. Orange represents enthusiasm, happiness, creativity, and stimulation.
To the human eye, orange gives the sensation of warmth, but is not as aggressive as red. Orange produces an invigorating effect, and stimulates mental activity. It is associated with healthy food so it boosts appetite. In heraldry, orange was symbolic of strength and endurance.