The graph, yaxing, is a graph shaped like the character ya.
This ding is quite similar to the example illustrated by R. W. Bagley, Shang Ritual Bronzes in the Arthur M. Sackler Collections, Arthur M. Sackler Foundation, 1987, pp. 486-87, and to several other excavated examples illustrated pp. 488-489, figs. 93.2-93.7.