Investopedia explains 'Buy To Open'
The buy and sell terminology for options trading is not as straightforward as it is for stock trading. Instead of simply placing a "buy" or "sell" order as they would for stocks, options traders must choose among "buy to open," "buy to close," "sell to open," and "sell to close." Beginning options traders should ensure that they understand the terminology and that they place their orders carefully to avoid preventable mistakes.
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