Wu (物) usually denotes an existence in the universe that has a form or an image. In general, the word has three different meanings. First, it refers to any concrete existence, encompassing all natural and man-made objects, all organisms and human beings. Second, it covers interpersonal matters and activities such as taking care of one’s parents, entering politics, or managing state affairs. In this sense, wu means “matter.” Third, the word sums up all existing physical and social matters, generally called “everything.”