They're not a name you'll encounter any more thanks to their acquisition by Oracle, but once upon a time, Sun Microsystems were every bit as big a deal in the world of computers as Apple and Microsoft. At one point, their Linux machines represented the only real competition in the market to the Microsoft Windows system. They lost the war in the end, but they made a good fight of it for a long time.
The Sun Microsystems logo looks a little dated by modern standards, which we'll forgive on the grounds that the company has been closed for almost a decade. Look at the diamond next to the text, though, and you'll notice that it's actually made up of the word 'Sun' running in every direction. Cleverly, each part of it could be interpreted as either a 'U' and an 'N' or an 'S' depending on your perspective. We guess they just really wanted to make sure that everybody knew their name!