
It is now possible to buy a physical represenation of a Primecoin, in the form of a silver coin. They look really cool and impressive, and we look forward to seeing these in stores some day.
» Read the full topic at Bitcointalk
Abbreviated XPM and denoted by the symbol Ψ, Primecoin is a cryptocurrency similar to Bitcoin. It was introduced on July 7, 2013 and the proof of work is based on computing specific sequences of prime numbers.