A more thorough explanation:

Definition: A corner is the point where two boundary lines meet, forming an angle. It is commonly used in surveying to mark the end of two survey lines.

Examples:

• Existent corner: A corner whose location can be verified by an original landmark, a surveyor's field notes, or other reliable evidence.
• Lost corner: A point in a land description, such as a landmark or natural object, whose position cannot be reasonably determined from traces of the original marks or other acceptable evidence. The location can be determined by reference to one or more independent points remaining in the description.
• Obliterated corner: A corner that can be located only with evidence other than that put in place by the original surveyor.

The examples illustrate the different types of corners that can be encountered in surveying. An existent corner is one that can be easily located and verified, while a lost corner is one that requires additional evidence to determine its location. An obliterated corner is even more difficult to locate, as it may require evidence that was not originally put in place by the surveyor.

In addition to surveying, the term corner can also refer to the acquisition of control over a commodity with the purpose of artificially enhancing its price. This is done by purchasing and selling the commodity in a way that depresses the market price, allowing the participants to purchase the commodity at a lower price and withhold it from the market for a time, thereby inflating its price. This type of corner is considered a criminal conspiracy if the means used are unlawful.