Apart from its regular circulating coinage, Solomon Islands has authorised a number of private mints to issue collector coins in precious metals, which are legal tender in the country but are not intended for general circulation. Many of them are in standard bullion sizes - typically, one ounce of silver (abbreviated as 1 oz Ag, where "Ag" comes from the Latin word for silver, Argentum). These are usually dedicated to historical or general popular culture themes not related to the country itself.
This premium bullion coin is the third in a series dedicated to the probably most fascinating number in mathematics - the Number Pi (π).
The number π is a mathematical constant. Originally defined as the ratio of a circle's circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter π since the mid-18th century, though it is also sometimes spelled out as "pi". It is also called Archimedes' constant. | 
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