Khaz (notation) explained

Khaz (Armenian: խազ) is an Armenian neume, one of a set of special signs (plural: khaz or khazes) constituting the traditional system of musical notation that has been used to transcribe religious Armenian music since the 8th century.^{[1] [2]}

Notes and References

1. [Vahan Kurkjian]
2. Armenian Neume System of Notation: Study and Analysis (2013) chapter 2: "Ancient Armenian manuscripts and their significance for the study of musical khaz notation" google books preview