Instead of traditional noteheads, numbers and letters are used (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, X, N), each representing a particular pitch of the chromatic scale. (It is an absolute-pitch system, not a relative-pitch system like Thumline.) They are placed at twelve different elevations on a 3-line staff that spans an octave. The upper and lower lines represent C. The middle line is F#. Stems extend upward or downward from the numbers. Stuckey has now withdrawn this proposal.
Earliest documentation: 1983
Source: Directory of Music Notation Proposals, section/page: 10/30, 11/1, 13/93
Similar notations: Numbered Notes by Jason MacCoy