An aberrisma is a type of scale step which can added to a MOS scale to turn it into a ternary scale. The typical range for an aberrisma is 20 to 60 cents. Ternary patterns such as Diasem (5L2m2s), Blackdye (5L2m3s), and Diamech (5L2m4s) can by made by adding aberrismas to diatonic scales.