Composer Ben Johnston uses a small seven ("") as an accidental to indicate a note is lowered by 36/35 (≈49 cents), or an upside-down seven ("") to indicate a note is raised by the same amount.Douglas Keislar; Easley Blackwood Jr.; John Eaton; Lou Harrison; Ben Johnston; Joel Mandelbaum; William Schottstaedt. p. 193. "Six American Composers on Nonstandard Tunnings", Perspectives of New Music, vol. 29, no. 1. (Winter, 1991), pp. 176–211."Ben Johnston's Extended Just Intonation – A Guide for Interpreters", John Fonville, p. 113, Perspectives of New Music, vol. 29, no. 2 (Summer, 1991), pp. 106–137. The Maneri-Sims notation system designed for 72-et uses the accidentals and for a quarter tone (36:35 or 48.77 cents) up and down.
