A gentle fyi, this is not dharma symbol. It was used by The DHARMA (Department of Heuristics And Research on Material Applications) Initiative, which was "a scientific research project that had a large presence on the Island between the 1970s and the early 1990s. The project is represented by variations of an octagonal logo, a variation of the Ba Gua, which comes from Taoist mysticism, that appear on most of its products and facilities."