Wall

[Sarah]

A very technical device designed to separate one area from another, and often to provide security to one or more of the said separated areas. It functions by a complex system of interconnected particles forming an impassible barrier that one should not walk into at medium to high speeds, or one risks damage.

[Sarah]

Wall in IndyCars. A generic term describing the concrete wall that lines the tracks, especially ovals.

[Lizzy Liz]

Wall in Eventing. Used in the cross-country event. Made of either brick, concrete blocks, railway sleepers or stones.