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Why are stop order called “stop” when it is in fact a “start” condition?
Historically they were conceived as a way to cut losses when the market turned against you. You would tell your broker something like "buy me 100 shares of Anaconda and stop me if it goes below $110" You can read references to this in old books like Reminiscences of a Stock Operator, the ABC of Options pricing, or the Day Trader's Bible.