The term 'bikini, for instance' can be summarized by the crossword solution 'ATOLL'. An ATOLL is a ring-shaped coral reef, island, or chain of islands formed of coral. It is typically found in the warm waters of the Pacific and Indian Oceans. Atolls are often made up of multiple small islands, and they are known for their beautiful beaches and crystal clear waters. The term 'bikini, for instance' is often associated with atolls because of the popular swimwear style that originated from the Bikini ATOLL in the Marshall Islands.