thumb|The lyrics of a song in the book, (Gekkin Gakufu; 1877) annotated in tō-on pronunciation
thumb|The lyrics of a song in the book, (Gekkin Gakufu; 1877) annotated in tō-on pronunciation
are Japanese kanji readings imported from China by Zen monks and merchants during and after the Song dynasty, as a form of . As with kan-on and go-on, the "tō" in "tō-on" does not denote the Tang dynasty but is a term meaning China itself.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).