An ouroboros is a special sign. 

An ouroboros is a special sign. 
Many people use it to show a cycle. It can mean life and death. It can also mean things starting over.
Ancient people in Egypt used this sign. 
Some people use it for science. A man named Kekulé saw it in a dream. This helped him learn about atoms.
Even some animals look like this. The armadillo girdled lizard curls up. It holds its tail in its mouth. 
An ouroboros is an ancient symbol. 
Ancient Egyptians used this symbol. 
Some thinkers use the symbol for science.
Even animals can look like this sign. The armadillo girdled lizard curls into a ball. It holds its tail in its mouth to stay safe. 
The ouroboros is an ancient symbol of a snake or dragon eating its own tail. 
This symbol has a very long history. One of the first examples is in the tomb of Tutankhamun from the 14th century BCE. In Egypt, the serpents may represent a god named Mehen. They show the beginning and the end of time. Later, in Roman times, people used the image on magical charms. A writer named Servius noted that Egyptians used it to show the cycle of a year. It was a way to show how time repeats itself.
Different groups of people have used the ouroboros for their own beliefs. Gnostics saw it as a symbol for the soul of the world. 
Scientists and thinkers have also found meaning in the symbol. A German chemist named August Kekulé had a famous dream about it.
In the natural world, you can see this shape in real life. The armadillo girdled lizard uses this pose for protection. 

The ouroboros is an ancient symbol depicting a snake or dragon eating its own tail. 
One of the earliest known representations of the ouroboros is in Ancient Egypt. 
The symbol traveled from Egypt into the Greek and Roman traditions. The 4th-century CE commentator Servius noted its use in Egypt. He explained that the image represented the cyclical nature of the year. This symbol was later adopted by several different belief systems. Gnostics used the serpent to symbolize eternity and the soul of the world. The text "Pistis Sophia" describes a twelve-part dragon surrounding the world. 
Many mythologies feature world-encircling serpents similar to the ouroboros. In Norse mythology, the serpent Jörmungandr is a child of Loki. This creature grew large enough to encircle the entire world. The legends of Ragnar Lodbrok also mention a serpent that bites its own tail. In South America, some indigenous groups believe an anaconda encircles the world-disc. Similar ideas appear in Jewish traditions regarding the Leviathan. The Zohar describes the creature as having its tail in its mouth. Rashi also describes the Leviathan as encompassing the entire world.
Eastern traditions also contain connections to this circular imagery. A Vedic text from the early 1st millennium BCE compares rituals to a snake biting its tail. In Indian thought, the symbol is used to describe Kundalini. The "Yoga-kundalini Upanishad" describes this divine power as a snake coiled upon herself. Some thinkers also use the ouroboros to represent the cycle of samsara. This refers to the continuous cycle of existence. Modern psychologists like Carl Jung viewed the symbol as an archetype. He saw it as a basic mandala used in alchemy.
Scientific discovery has also been influenced by this symbol. The German chemist August Kekulé had a famous vision of the ouroboros.
In modern science, the concept of self-reference is often linked to the ouroboros. Cybernetics uses the symbol to describe feedback loops in living systems. The term "autopoiesis" refers to self-producing autonomous systems. This is sometimes called the "riddle of the living." In the natural world, the armadillo girdled lizard shows this shape physically. 
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