Fiducial

fiducial \fə-ˈdü-shəl\ adjective: 1. taken as standard of reference {a fiducial mark},
2. founded on faith or trust,
3. having the nature of a trust; fiduciary

Etymology: Latin, from fidere to trust

SIX — The restaurant disappeared long ago, and it is recalled merely as an odd historical footnote provoking giggles in the classroom.