紫菜

紫菜	zǐ cài	edible seaweed of genus Porphyra or genus Pyropia, esp. one used to make dried sheets of nori
紫	zǐ	purple / violet
菜	cài	vegetable; greens (CL:棵) / dish (of food) (CL:样,道,盘) / (of one's skills etc) weak; poor / (coll.) (one's) type