Logos that became legends: Icons from the world of advertising

[snopes]

First designed by the current Apple CEO, Steve Jobs, the IT giant's original logo was completely different from the one we know today. It depicted Sir Isaac Newton sitting below a tree with an apple falling on his head – a tribute to his discovery of gravity.

That logo was replaced in 1976 by a rainbow-coloured silhouette of an apple with a bite taken out of it, an idea dreamt up by the graphic designer Rob Janoff, which was to remain the same until 1999 when Apple began using a monochrome logo.

The urban myth says that the bitten apple is a reference to Alan Turing, the pioneer of the Enigma code and "father of the computer", who committed suicide in 1954 by taking a bite from a cyanide-laced apple. Janoff insists that the apple simply represents knowledge.

http://news.independent.co.uk/media/article3307583.ece