Describe symbolism in Life, the Universe and Everything by Douglas Adams

The Wikkit gate is a model of the key that has locked up the forces of Krikkit and its symbol is revered across the entire universe. It is made up of three pillars, one of steel, one of plastic and one of wood, with two short pieces of silver and gold spanning the tops of the pillars. The real key, the announcer explains, was blasted apart and its pieces spread throughout the universe.