Trust Zones are areas of trust separated by Trust Boundaries. Each Trust Zone is associated with a numeric trust rating where 1 is untrusted and 100 is very trusted. This relative rating scale is used as a variable when calculating the Likelihood component of the risk rating calculation.
Trust Zones are defined through the Configuration → Trust Zone Definitions tab:
The Trust Zones configured in this tab will be displayed to the user in the Component Questionnaire. The end user will only see the name and description of the zone, not its trust rating: