What is a Greek letter or Chinese symbol of immortality the answer definitely 3 letters and last almost certainly you?

* Omega is the last letter of the Greek alphabet and often symbolizes the end, but also the completion of a cycle, hinting at immortality or rebirth.

* While there isn't a direct three-letter Chinese symbol for immortality, the sound and the final letter "E" create a playful, almost pun-like effect to lead to the answer.