Final answer:
The Graiae were a trio of old women from Greek mythology who were born with only one eye and one tooth between them. They shared these features and would pass them among each other when needed.
Step-by-step explanation:
The Graiae were a trio of old women from Greek mythology. What is unusual about them is that they were born with only one eye and one tooth between them. They shared these features and would pass them among each other when needed. This made them a unique and memorable part of Greek mythology.