So that the sheet is balanced and less likely to distort, there are typically an odd number of plies. Because the grains of the surface ply are bonded against one another, and there are an odd number of composite elements, Plywood has a high rigidity perpendicular to the direction of the grains. Only plywood that is smaller, thinner, and of inferior quality can have its plies (layers) placed at right angles to one another. Five plies in steps of 45 degrees (0, 45, 90, 135, and 180 degrees) are often intentionally used in higher-quality plywood products to provide strength along various axes. The verb plier, which means "to fold" in French, came from the Latin verb πλέκω, which came from the Greek verb.
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