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Frix’s system is similar to the other systems that use a 5-line staff, except that it makes the first ledger line D (instead of C). This may have been because D is a point of symmetry in the pattern of white and black keys on the piano and other keyboard instruments.

For clef signs, Frix’s system uses a Δ placed at the position of the D above Middle C, with a ledger line through it.

Earliest documentation: 1992

Source: Directory of Music Notation Proposals, section/page: 10/6,14,17,25,26,28,32,34,36, 11/3, 13/12,33,42,74,82,87,97,103,104
US patent

Manuscript Paper: Discontinuous Staves, Continuous Staves