fiducial

Etymology

From Late Latin fīdūciālis, from fīdūcia (“trust, reliance”) + -ālis, from fīdō (“I trust”).

adj

  1. Accepted as a fixed basis of reference.
    Rulers and coins make good fiducial markers in photographs.
  2. Based on having trust.

noun

  1. In photography, a familiar reference object used to show size or scale, such as a ruler or a coin; a fiducial marker.
  2. In manufacturing, a small mark on a circuit board used to align components; a fiducial point.
    Coordinate term: registration mark (in printing)

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