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Originally bollards were used on ships, primarily for mooring, i.e. tying lines to dock.
Today they have two general purposes. Bollards are short vertical posts found almost everywhere to protect assets. Sometimes called simply a "guard post", a bollard may protect buildings, utilities, equipment, or pedestrians. Common examples would be to protect a drive-thru lane at a bank, a fire hydrant in a parking lot, or pallet rack in a warehouse. See some applications here: https://www.slowstop.com/resources/applications. In general, this is vehicle access denial. Some applications call for high strength security bollards, such as in front of embassies and other government buildings.
Second, in Europe the word bollard is used to describe a short vertical sign, often found on a median, directing traffic around the island.
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What exactly is the purpose of a bollard?
A bollard is a post, which is usually used to moor a boat in the water. It can also be used to describe a variety of structures, which control or direct road traffic.
Is the relation a function?
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The function f(x) x3 is called the function?
The cubic function.
If an inverse function undoes the work of the original function what does the original function's becomes the inverse function's domain?
Range
What are the ways in describing a function?
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
