"sasang" typology divides people into four types based on their biopsychosocial traits with a combination of yin/yang and greater/lesser: "tae-yang" ( 태양, ) or "greater yang"; "so-yang" (소양, ) or "lesser yang"; "tae-eum" (태음, ) or "greater yin"; and "so-eum" (소음, ) or "lesser yin".