What element has the symbol 'Cn'?

The story behind the answer

Copernicium is element 112 on the periodic table. It was officially named in 2010 after Nicolaus Copernicus, the astronomer who proposed the heliocentric model of the solar system.

Copernicium is recognized because:

It has a unique number of protons (112). It was experimentally produced and confirmed. It meets the criteria for element recognition.