The Ethereum logo was created by a guy named Vitalik Buterin. He’s a Russian-Canadian programmer and writer who’s best known for his work on the Ethereum project. The logo is meant to represent the Ethereum network and its capabilities. It’s made up of two parts: the ether symbol and the world computer.
The ether symbol is inspired by the Greek letter Ξ, which represents something that’s indefinite or unmeasurable. The world computer is meant to represent the fact that Ethereum is a global, decentralized platform that can be used by anyone.