What is the chemical symbol for gold?

The chemical symbol for gold is Au, which is derived from its Latin name "aurum." The symbol Au is used universally in the field of chemistry to represent gold in various chemical equations and contexts. This connection to its Latin roots is a common theme among various elements, where historical names influence the modern symbols used today.

The other options provided represent different elements: Ag stands for silver, derived from "argentum"; Fe denotes iron from "ferrum"; and Hg represents mercury from "hydrargyrum." Each of these symbols corresponds to their respective elements and helps in identifying them in chemical contexts, but they do not pertain to gold. Thus, Au is the unique and correct representation for gold among the choices listed.