Fiducial

Look up fiducial in Wiktionary, the free dictionary.

Fiducial may refer to:

• Fiduciary, in law, a person who holds a legal or ethical relationship of trust
• Fiducial inference, in statistics, a form of interval estimation
• "Fiducial line" or "fiducial edge" of an alidade, an instrument used to measure the angle to a distant object
• Fiducial marker or fiducial, an object or marking placed in an image for use as a point of reference
• Reference point (disambiguation), or origin of a frame of reference

In particle physics

• Fiducial cross section, in particle physics experiments, a cross section in which a detector operates with high sensitivity
• Fiducial volume, in low-background physics experiments, an inner volume of particle detector media in which background events are largely excluded