Where does the NSG logo come from?

The NSG was presented by the City of Florence on the occasion of its hosting of the 1999 Nuclear Suppliers Group (NSG) Plenary with the rights to use one of Michelangelo's Campidoglio pattern. Michelangelo’s design was used to bring harmony and order to the irregularly-shaped Capitoline hilltop.  For the NSG it symbolizes NSG Participating Governments’ continuing effort to bring order to a sometimes uneven export control system and non-proliferation landscape. More details can be found here.