shrine listed in the Engi-Shiki
Refers to a Shinto shrine that was officially registered in the Engi-Shiki, a 10th-century Japanese legal code. This is a historical and domain-specific term used in discussions of Shinto history and shrine rankings.
See also: 延喜式 (えんぎしき)
この神社は延喜式に記載された式内社です。
This shrine is a shrine listed in the Engi-Shiki.
式内社の研究は日本古代史において重要だ。
Research on shrines listed in the Engi-Shiki is important in ancient Japanese history.
From 式 (ceremony, code) + 内 (inside, within) + 社 (shrine), literally 'shrine within the code', referring to shrines registered in the Engi-Shiki.