Wu Collection, Upper Volume Radical: Tile (wǎ) Piz Kangxi strokes: 18 Page 752, Entry 17 Pronounced pi. According to the Explaining Graphs and Analyzing Characters (Shuowen Jiezi), it refers to a roof tile or brick. According to the Approaching Elegance: Explaining Buildings (Erya Shigong), a roof tile or brick is called a pi. According to the Broadening Elegance (Guangya), a pi is a brick. In the Book of Odes (Shijing), it is written: There are bricks in the central courtyard. The commentary states that a pi is a roof tile or brick. In the Rhapsody on the Changmen Palace (Changmen Fu) by Sima Xiangru, it is written: Arranging the tiles and bricks of carved stone, resembling the patterns of tortoise shell. The commentary states that in the region east of the Yangtze River, a pi is called a brick. In the Book of Jin (Jin Shu), Biography of Tao Kan, it is written: While Tao Kan was in the province, whenever he was free, he would move a hundred bricks outside his study in the morning and back inside in the evening. Also, according to the Collection of Rhymes (Jiyun), pronounced bie, with the same meaning.