Google has ha several logos since its renaming from "BackRub". The current official Google logo was designed by Ruth Kedar, and is a logotype based on the Catull typeface. The company also includes various modifications and/or humorous features, such as cartoon modifications, of their logo for use on holidays, birthdays of famous people, and major events, like the Olympics. These special logos, designed by Dennis Hwang, have become known as Google Doodles.