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"What3words is a proprietary geocode system designed to identify any location with a resolution of about 3 metres (9.8 ft). It is owned by What3words Limited, based in London, England. The system encodes geographic coordinates into three permanently fixed dictionary words. For example, the front door of 10 Downing Street in London is identified by ///slurs.this.shark.[1] What3words differs from most location encoding systems in that it displays three words rather than strings of numbers or letters.
What3words Ltd. has a website, apps for iOS and Android, and an API for bidirectional conversion between what3words addresses and latitude/longitude coordinates.
The company was incorporated in March 2013[6] and a patent application for the core technology filed in April 2013."
What3words - Wikipedia
The simplest way to talk about location