Greece Letter Pi Sign Lariat Necklace Back to School Gift (Silver)
Material: MetalMetal type: Stainless SteelClasp type: Spring RingGem type: No GemstoneMaterial: supreme stainless steel pi charm, rhinestone alloy charm,. It's lead free and nickel free,hypoallergenic, it doesn’t rust, change color or tarnish.Size: chain length 18 inch with 2 inch extension.Stainless steel wire bangle diameter 60mm and it is adjustable, fit most people's wrist(accommodates wrist sizes 6-8).This necklace/bracelet features and a Pi charm - and makes a superb graduation gift for a mathematician or scientist.The irrational number Pi is a mathematical constant, the ratio of a circle's circumference to its diameter, approximately 3.14. It has been represented by the Greek letter since the mid-18th century.The symbolism comes from the first letter of the word region ( Περιφέρεια - Periferia in Greek, Π - Pi) and has established itself internationally. In the Latin alphabet is represented as Pi when Greek characters are not available. Pi is also known as Archimedes constant.