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.

Google on Wednesday celebrated the 30th anniversary of the mathematical constant Pi - a fundamental element of several mathematical fields - with a doodle of actual pies.

Google shared behind-the-scene action of making the Google Doodle on Pi Day. In geometry, pie plays an important constant in finding out the area of a circle.

In 2010 as well, a Google Doodle was dedicated to **Pi Day**. Though modern mathematicians have calculated more than one TRILLION decimal places beyond the standard "3.14", pi is an irrational number that continues on to infinity.

The doodle has been created by award-winning pastry chef, Dominique Ansel.

Did you know that there is Pi language? Wondering how? Draw a circle with a protractor and then measure its diameter or radius with a ruler.

Pi's existence was recorded as early as nearly 4,000 years ago. For the record, this author went to the calculator to see what the value is. With people all over celebrating today, NASA too has invited the public to celebrate **Pi Day** (March 14) by organising a "Pi in the Sky" challenge.

It is believed that physicist Larry Shaw was the first to celebrate the day at the Exploratorium in San Francisco with his peers and staff nearly 30 years ago. It features math problems for calculating Martian earthquakes, helium rain on Jupiter and the rotation rate of the asteroid 'Oumuamua.

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