The mostly used symbol that has been followed by almost all cultures of the Earth is the Sun. This symbols was worshiped as the supreme cosmic power. Its the life force that enable all things to live and grow. Its the supreme source of heat and energy. It also symbolize the youth, passion etc. It also gives light, so its also a symbol of enlightenment. Its also a sign of royalty. In some cultures the sun is the eternal father. The rising and setting sun also expresses birth, death and rebirth or resurrection.
PowerThe Sun is always considered as a symbol of power and strength.
Japanese FlagIn the Japanese Flag the Sun is being used as a symbol of power and strength. In that flag the red disc represents the rising Sun.
The Sun was also used as a symbol of power, strength and rebirth in the Sun King and Freemasonry.