郑码

zhèng mǎzhengma

1. Zheng coding
2. 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
3. also called common coding 字根通用碼|字根通用码[zi4 gen1 tong1 yong4 ma3]

Study it in Yanamino