A rampart built around the top of a castle with regular gaps for firing arrows or guns. Also called battlements. Crenellations can be found in most European castles, and are particularily noticable as a feature of the Great Wall of China.

They look kind of like this:


       |-------|       |-------|       |-------|
       |       |       |       |       |       |
       |       |       |       |       |       |
       |       |       |       |       |       |
-------|       |-------|       |-------|       |------- ...

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