The Ether logo is a stylized letter "e" with a horizontal line passing through the middle, resembling a double-barred "e". The logo represents the Ethereum blockchain network, which uses the cryptocurrency Ether (ETH) as its native currency.

The double-barred "e" in the logo is often interpreted as a symbol of connectivity and interoperability, highlighting Ethereum's goal of creating a decentralized platform for building and running applications. The horizontal line in the logo represents the blockchain, which is a digital ledger that records all transactions on the network.

The logo was designed by a graphic designer named Christopher Brewster, who was hired by Ethereum co-founder Joe Lubin in 2014 to create a visual identity for the network. Brewster has stated that he was inspired by the simplicity of the Bitcoin logo and wanted to create a logo that was easily recognizable and could stand the test of time.