Phi is a number approximately 1.61810339887… Not so well known as Pi or e, yet Phi is a very popular number. You can determine its rough value from the equation 1/phi = phi-1 which is almost magical. Ie 1/1.6181033 = 0.6181033.
Phi has other properties as well. It is the ideal ratio for width to height- to get the most pleasing view. It is known as the golden ratio and is found frequently in nature. This site will probably tell you more than you ever want to know about it! Some very nice illustrations as well.
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