Fence
movement across a boundary. Generally distinguished from a wall by the solidity of construction - a wall is usually restricted to such barriers made from solid brick or concrete, blocking vision as well as passage (though the definitions do overlap somewhat).
There are fences constructed for several different purposes:
Some of the technologies developed for fencing include
Alternatives for a fence are a hedge or a ditch (with or occasionally without water).
See also Wire obstacle, Separation wall.
A balustrade or railing is a kind of fence to prevent people from falling over the edge, e.g. on a balcony, stairway (see Stairway#The_railing_system), roof, bridge or elsewhere near a body of water, places where people stand or walk and the terrain goes steeply down, etc.
A fence is a person who specializes in the purchase and sale of stolen property from thieves.
In statistics, the word fence refers to a value beyond which an observation is considered an outlier.
There are also the Fence Lizard and town of Fence, Wisconsin.
