Internal combustion piston engines are typically arranged with their pistons in rows, or 'planes', moving inside individual cylinders. This allows the engine block to be built from a single piece of machined metal. Engines sometimes have more than one row of pistons, each with their own block, referred to as cylinder banks.
Not all engine configurations have cylinder banks. In a Radial engine each piston is in a separate cylinder, a feature common in earlier in-line engine designs as well.
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