U+1D0A2 "𝂢" Byzantine Musical Symbol Martyria Protos Ichos Unicode Character

U+1D0A2 "𝂢" Byzantine Musical Symbol Martyria Protos Ichos is a graphical mark used in the Byzantine musical notation system, which is the traditional liturgical chant notation of the Eastern Orthodox Church and other Byzantine-rite churches. This specific character, whose name translates roughly as "martyrion (or witness) of the first mode," functions as an intonation or key indicator, telling chanters that the music to follow belongs to the Protos Ichos (First Mode), one of the eight principal modes of Byzantine chant. It typically appears at the beginning of a hymn or musical section to establish the melodic framework and scalar foundation for the performance.