Original: Its name derives from the Greek words Ï Î Î 1\/2 Î Ï Ï Ï and Î Ï Î, meaning visible life, since it was once believed that life began in the Cambrian, the first period of this eon.
Simplified: Its name is derived from the Greek words Ï Î Î Î 1\/2 Ï and Î Ï Î, meaning make life appear, since it was once believed that life began in the Cambrian, the first geological period of this eon.