The story
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: An SI unit of time equal to 10²⁷ seconds. Symbol: Rs. (= quintillions of years, a hypothetical time span that is meaningless except in speculative contexts such as theoretical physics, philosophy, religion, and humorous hyperbole) Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.