What are some symbols/pictures that represent The Age of Enlightenment?

Hmm, well the Age of Enlightenment preceded the Neo Clical movement right? And during that time period many artists reverted back to styles similar to ancient Greek and Roman art, and a common aspect in Greek/Roman art were profile views of the heads of the figures in the paintings. So, perhaps a profile of an elegant looking head? I don't know. Look up art from that era and take a certain aspect/design that was often used. For example, if you wanted something that represented the Rococo era you would do an extravagant and curvilinear design done in pastel colors.