freestanding structure preventing movement across a boundary

This is about a fence. You may be looking for the sport of fencing.

A wooden fence.
A metal fence.

A fence is something built like a low wall, often made of metal or wood, to keep something in or to keep something out. It differs from a wall, which has a foundation. Fences are usually supported by fenceposts. Fences can be large or small. Many are used in gardens but some are used in different places.

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