Which element has the chemical symbol 'O'?

The element with the chemical symbol 'O' is Oxygen. In the periodic table, each element is designated by a unique one- or two-letter symbol, which often derives from its English name or from Latin. The symbol 'O' is specifically associated with Oxygen, a vital element for life on Earth as it is a key component of water and is essential for respiration in most living organisms. It plays a crucial role in various chemical processes, including combustion and oxidation reactions.

In the context of the other options, Osmium has the symbol 'Os,' Gold is represented by 'Au,' and Iron is designated as 'Fe.' Thus, knowing the correct symbols is essential for understanding chemical elements and their interactions.