What brand is the old Taoist holding? It seems that officials in the Song Dynasty also had it.

Wat, also known as hand board, jade board or decorative board. It is a tool for ancient officials to go to the temple to face the monarch. In ancient times, when the ministers of civil and military affairs appeared in front of the king, they held a water bowl in their hands to record the king's life or will, and they could also record the words to be played to the king on the water bowl to prevent forgetting. It is recorded in the Book of Rites that it is "2 feet 6 inches long and 3 inches wide". Because the ancient size is different from today's, 2 feet 6 inches is shorter than today's 2 feet 6 inches. In the fourth year of Wude in the Tang Dynasty, officials with more than five grades held ivory rafts, while officials with less than six grades held bamboo rafts. The Ming dynasty stipulated that officials with more than five grades should hold ivory warehouses, and officials with less than five grades should not hold them. Since the Qing Dynasty, water boards have been abandoned.