“- See fee? What’s that? - Just the chemical symbols for the elements carbon and iron, Elijah. Carbon is the basis of human life and iron of robot life. It becomes easy to speak of C/Fe when you wish to express a culture that combines the best of the two on an equal but parallel basis. - See fee. Do you write it with a hyphen? Or how? - No, Elijah. A diagonal line between the two is the accepted way. It symbolizes neither one nor the other, but a mixture of the two, without priority.” (The Caves of Steel, Isaac Asimov)