The river crab is a homonym of harmony, which is often used by netizens to refer to "harmony" on the Internet.

One is Yangcheng Lake hairy crabs, which are really edible. Another explanation is to describe that after buying a stock, the stock market fell, and the stock lost money, but it has not been sold. All the money is on the stock and it can't move. That stock holder is called hairy crab.