What's the meaning of -D in Taiyi Yingtuo MC500?

Are you talking about Taiyi Yingtuo MC 500,41H87-DQ-D?

This is the factory number, that is, the product number, which represents this year's number, and which one of the same kind is the model and some parameters of this machine.

Taiyi Yingtuo MC500 is a product of Dongguan Taiyi Yingtuo Technology Co., Ltd., which was established in June 2005. Its subsidiaries include Dongguan Panti Haoyu Liquid Metal Co., Ltd. and Dongguan Taizhijie Precision Machinery Co., Ltd. ..