Number of Xu strokes: 10. The five elements are: golden seven and five squares.
Three talents and mathematics
They are all auspicious, and there is no unlucky special mathematics. Xu (100) Xu (100) Xu Minrong (100) Xu Wangui (100) Xu Xinxian (96). Xu (100) Xu Yuejia (96) Xu Yuanshan (100) Xu Lanqing (100) Xu Qingyan (100) Xu Yuane.