The term 'Lagooon Encirclers' refers to Atolls, which are ring-shaped coral reefs or islands that surround a lagoon. Atolls are typically found in tropical regions and are formed by the accumulation of coral debris over time. They are home to a variety of marine life and provide a habitat for many species of fish, birds, and other animals. Atolls are also important for coastal protection, as they can help reduce the impact of storms and waves on nearby shorelines.