The company What3words.com has labeled every 3m x 3m square of the earth's surface in multiple languages. This symbol indicates a three-word identifier of one of those squares.

For example, ///sustaining.increasingly.tank indicates the exact place on earth where this is being written.

The company's app couples these identifiers with GPS to assist emergency services, outdoors recreation and general use. These three words can be used to completely replace a street address.