Scale (anatomy)
In most biological nomenclature, a scale (Greek λέπιδ lepid, Latin squama) is a small rigid plate that grows out of an animal's skin to provide protection. In lepidopteran (butterfly and moth) species, scales are plates on the surface of the insect wing, and provide coloration. Scales are quite common and have evolved multiple times with varying structure and function.
Scales are generally classified as part of an organism's integumentary system. There are various types of scales according to shape and to class of animal.
Read more about Scale (anatomy): Fish Scales, Reptilian Scales, Arthropod Scales, Bibliography
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—Henry David Thoreau (1817–1862)