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As far I know, unconfirmed transactions are stored in the memory pool. However, in the Bitcoin wiki, I see a data structure called transaction pool. Are they the same thing or not? Also for the orphan transactions, as far as I know they are stored in data structure called orphan pool, right?

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That is referring to what is now called the mempool.

The wiki is unmaintained, and contains mostly outdated or incomplete information. I would suggest you use the bitcoin.org documentation instead.

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