original Chinese character coding based on component shapes, created by Zheng Yili 鄭易里|郑易里[Zheng4 Yi4 li3], underlying most stroke-based Chinese input methods
also called common coding 字根通用碼|字根通用码[zi4 gen1 tong1 yong4 ma3]
Definitions (Wiktionary)
noun
Zhengma, an input method for Chinese based on character shape