Triodion; Lenten Triodion
A liturgical book used in Eastern Orthodox and Eastern Catholic traditions during the pre-Lenten and Lenten seasons.
The Triodion is a liturgical book used during the preparatory period for Great Lent in the Eastern Orthodox Church.
The term 三歌斎経 is a Japanese rendering of the Greek 'Triodion', referring to a liturgical book containing three-canticle canons. The exact derivation of the kanji spelling is uncertain; it is conventionally associated with this specific religious text.