Which statement accurately describes the chemical symbol of an element?

The statement that accurately describes the chemical symbol of an element is:

**The chemical symbol always begins with a capital letter.**

To clarify the other statements:
- The chemical symbol is not always a single letter; it can be one or two letters (e.g., O for oxygen, Na for sodium).
- The chemical symbol does not always start with the same letter as the name of the element (e.g., Fe for iron).
- The chemical symbol cannot be shared by more than one element; each element has a unique symbol.