The award-winning pastry chef created the doodle using actual caramel apple pies.
The Google letters in the doodle are constructed from pastry, butter, apple and orange peel.
Pi (Greek letter "I") is the symbol used in mathematics to represent a constant -- the ratio of the circumference of a circle to its diameter -- which is approximately 3.14159.
In geometry, 'Pi' plays an important constant in finding out the area of a circle.
According to piday.org, Pi has been calculated to over one trillion digits beyond its decimal point.
"As an irrational and transcendental number, it will continue infinitely without repetition or pattern. Pi's infinite nature makes it a fun challenge to memorise, and to computationally calculate more and more digits," it said.
Mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately 22/7.
The symbol was first used in 1706 by William Jones.
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