“”””Bought for 241 won and sold for 360,000 won””””… What is this ”1 in 1 billion” probability?

“Buy for 241 won and sell for 360,000 won.”
What is this thing called ‘1 in 1 billion’ guaranteed?
billionth of a billionth
The ‘perfectly round egg’ that appears as an object was recently sold on a shopping mall for about 1,500 bar of its original price.
It’s a hot topic after winning the bid
Afterwards, the egg was put on the market again by the charity and was eventually sold to a buyer from Ikpyeong for 200 pounds.
An official from a light manufacturing company said, “The odds of producing an egg this close to a perfect circle are 1 in a billion,” so the rarity of the egg is high.
Let’s emphasize it.