Why is a swimming pool called pool?

The word "pool" comes from the Old English word "pol", which means "a small body of water". This word was used to refer to any body of water, regardless of its size, but over time it came to be used more specifically to refer to swimming pools.

There are a few possible reasons why swimming pools are called pools. One possibility is that the term was used to distinguish them from other bodies of water, such as lakes or rivers. Another possibility is that the term was used to describe the shape of swimming pools, which are often rectangular or oval in shape.

Whatever the reason, the term "pool" became the standard term used to refer to swimming pools, and it is still used today.