The Symbol of Wisdom. Representation of Athena , the Ancient Greek goddess of wisdom, the arts and justice. Also a representation of Minerva, the equal of Athena in the Roman Empire.
Nacre (also called mother of pearl), is an organic-inorganic composite material produced by some molluscs. It is a hard, shining, iridescent material. It is formed in the inner shell of some of the more ancient lineages of bivalves, gastropods, and cephalopods to repair their damaged shells or to cover some objects inside of them. This is used by some pearl pickers, placing certain small items inside molluscs, knowing they will be covered in nacre, forming pearls or other valuable objects. The molluscs that produce the most beautiful nacre are the Abalone and the Nautilida, among other. Nacre is used in medicine for skin care, as an exfoliant.