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Table 2 Triangular fuzzy (TFN) scale and its inverse TFN scale for the linguistic pairwise comparison scale

From: Sustainability indices for energy utilization using a multi-criteria decision model

 Rating scaleTriangular fuzzy numbersTriangular fuzzy reciprocal numbers
Just equal 111111
Equal importance11/21/13/22/31/12/1
Weak importance of one over another21/13/22/11/22/31/1
Moderate importance of one over another33/22/15/22/51/22/3
Very strong importance42/15/23/11/32/51/2
Extremely strong importance55/23/17/22/71/32/5