Fiducial Mark

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Fiducial Mark </dt>
An internally generated identification mark on a film; two or more of these are generally used for orienting a film for reading, and for determining the geometric center of the film. </dd>
''The L-shaped corner marks and the + mark near the picture center, which are on the focal plane of the Tiros vidicon camera are fiducial marks. Their appearance on the image permits various calibrations such as determination of the degree of enlargement needed to fit the picture to the rectification grids, etc. [[/a>|/a>]] </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use