Immortality, the cycle, infinite.
These are the symbols represented by Ouroboros in the realm of magic.
However, at the First University, Ouroboros bears another meaning.
That would be the Auspicious Society.
It's well known that the Auspicious Society originated from the Blood Comrades, many of its core members were senior members of the Blood Comrades.
When Mike Gold Cypress Plano created this society, he never attempted to hide his ambition from others. On the contrary, he repetitively told his buddies the story that 'the Blood Comrades originated from 3A' along with the old story of 'the merger of judgement and will'. Coupled with the unique 'Ouroboros' symbol of the Auspicious Society, it's impossible for many not to make certain associations.
Every new member of the Auspicious Society receives an Ouroboros tattoo.
Depending on differences such as gender, age, ability, and position, these tattoos can be placed on the neck, upper arm, wrist, or finger.