U+1D0A9 "𝂩" Byzantine Musical Symbol Martyria Tetartos Legetos Ichos Unicode Character

U+1D0A9 "𝂩" Byzantine Musical Symbol Martyria Tetartos Legetos Ichos is a specialized glyph from the Byzantine Musical Symbols block, used in the notation of Eastern Orthodox chant. It represents a martyria, or a mode indicator, specifically for the tetartos (fourth) mode in the legetos (spoken or recited) style of the ichos system, which classifies melodic formulas in Byzantine music. This symbol helps guide performers in identifying the correct tonal framework and expressive context for a given passage of chant, preserving the nuanced oral traditions of Byzantine liturgical music in written form.