It's Moz's Metric. Majestic has their own metric (TF/CF Trust Flow and Citation Flow) and Ahrefs (UR/DR URL Rating and Domain Rating). I would say Ahrefs's is

It's Moz's Metric. Majestic has their own metric (TF/CF Trust Flow and Citation Flow) and Ahrefs (UR/DR URL Rating and Domain Rating). I would say Ahrefs's is marginally more accurate then the others but to be honest any of these numbers can be gamed and are not a accurate representation of a domain and/or backlink.