What is the symbolism of "Amber" in the novel, The Chronicles of Amber?

Amber represents "form" or "order" or "pattern" — indeed it was formed by the creation of a "Pattern" in the midst of Chaos, a Pattern that is inscribed in the genes of all of the Lords of Amber. For Zelazny the Universe (and any microcosm of the Universe — a society or an individual) must maintain a dynamic balance between form and chaos (or law and freedom); one must never overwhelm the other.