What is Trust Flow (TF)?
Trust Flow is a metric created by Majestic that is designed to reflect on a 100 point scale the quantity and trustworthiness of links that are pointing to a website or URL.
A website or page with a higher score represents a site that has more trustworthy and less questionable links.
To calculate the ranking Majestic look at a range of seed sites and work on a process they call Majestic Trust Flow.