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The standard staff has seven lines, with the top and bottom lines being bold and five standard solid lines between them. The bold lines are C. In the image above two of these staves have been stacked to show a two octave span. Lieber’s piano staff consisted of six of his staves stacked for a span of six octaves.

Earliest documentation: Albert Brennink’s Chromatic Notation (1983), p. 11, 26.

Source: Directory of Music Notation Proposals, section/page: 13/51