Which element has the chemical symbol O?

The element with the chemical symbol O is oxygen. In the periodic table, each element is represented by a unique one- or two-letter symbol, which often derives from the element's name in English or Latin. For instance, the symbol O is derived from the English name "oxygen." Oxygen is a vital element for life on Earth as it is essential for respiration in most living organisms and is also a key component of water. The other elements listed have different symbols: gold is represented by Au, osmium is Os, and iron is Fe, each reflecting their own unique properties and historical naming conventions. This deep connection between symbols and elements is fundamental in chemistry, allowing scientists and students to communicate findings and concepts efficiently.