Where does “二字銘” come from?

二字銘 (Japanese) comes from Japanese 二字, from Japanese 二, from Middle Chinese 二 — two.

二字銘 (Japanese): an inscription of two characters

Definitions

an inscription of two characters

Ancestry of “二字銘”, step by step

二字銘 traces back through two separate lines of ancestry.

via Japanese 二字

Step	Language	Word	Meaning
1	Japanese	二字	two characters
2	Japanese	二	two, 2; second; two
3	Middle Chinese	二	two

via Japanese 銘

Step	Language	Word	Meaning
1	Japanese	銘	inscription
2	Middle Chinese	銘	—

Every word from Middle Chinese 二 →Every word from Japanese 二 →Every word from Japanese 二字 →