"Inzen" is a document which an Inshi (official of the In no cho, or Retired Emperor's Office) issues in a format of hosho (a document informing a decision of the upper ranked personages such as an emperor or shogun) upon direct orders from Daijo Tenno (the Retired Emperor).
院宣（いんぜん）とは、太上天皇からの命令を受けた院司が、奉書形式で発給する文書。