A unit of interval measurement proposed in 1898 by Widogast Iring, and again in 1932 under the name "centitone" by Joseph Yasser.
A centitone or iring is the logarithmic division of the 12-tone equal temperament (12-edo) semitone into 50 equal parts. It is calculated as the 600th root of 2, expressed mathematically as 600√2, or 2(1/600), with a ratio of approximately 1:1.001155913. It is an irrational number. The formula for calculating the centitone or iring value of any ratio is: cents = log10r * [600 / log102] or cents = log2r * 600 , where r is the ratio.
A centitone or iring is: