Trust group
From Organic Design wiki
A group of people who all trust each other. People can belong to many trust-groups which all form a trust-network. Information is able to pass safely and securely between any two people in such a network because the route can be divided up so that information only ever passes between people who trust each other.
Trust-groups can be formalised into single entities that can trade, own property or control accounts. The type of entity best suited to such a group is a trust. Trusts can be formed purely out of contracts formed between the members of the trust-group.