tonal system
hexadecimal (base 16) system of notation, arithmetic, and metrology proposed by Nystrom in 1859
en-GB/ˈtəʊnəl ˈsɪstəm/
en-US/ˈtoʊnəl ˈsɪstəm/
hexadecimal (base 16) system of notation, arithmetic, and metrology proposed by Nystrom in 1859