Which element is represented by the symbol 'Pt'?

The element represented by the symbol 'Pt' is Platinum. In the periodic table, each element is assigned a unique symbol, which often reflects its name or its Latin origin. Platinum is a dense, malleable metal known for its resistance to corrosion and high melting point. It is often used in jewelry, industrial processes, and as a catalyst in chemical reactions due to its excellent properties.

The other options, while being elements on the periodic table, correspond to different symbols: Silver is represented by 'Ag,' Copper by 'Cu,' and Zinc by 'Zn.' Thus, 'Pt' specifically refers to Platinum, affirming that it is the correct choice for this question.