Constants collection

A set of Maths Society products featuring familiar mathematical constants. Why not collect the set?

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$Maths mug with Phi golden ratio symbol$

Maths mug with Phi golden ratio symbol

$Maths mug with Pi symbol$

Maths mug with Pi symbol

$Maths pencil case with 100 digits of Pi$

Maths pencil case with 100 digits of Pi