fiducial
UK /f(a)ɪˈdjuːʃ(ɪ)əl/ US /fəˈd(j)uːʃəl/
adj 2noun 2
Definitions
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.
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