Fiducial
Part of speech: noun
Definition: In manufacturing, a small mark on a circuit board used to align components, a fiducial point.
Part of speech: adjective
Definition: Accepted as a fixed basis of reference. Based on having trust.
Trusty
Part of speech: adjective
Definition: Reliable or trustworthy.
Part of speech: noun
Definition: A trusted person, especially a prisoner who has been granted special privileges.