the original garden, used as an archetype from which free gardening derived much of its mythology. Often applied in conjunction with the initials of the names of the four associated rivers Pison, Gihon, Hiddekel (Tigris) and Euphrates. The letters A, N and S are also used. They refer to the words of each degree - Adam, Noah, and Solomon. Eden (Adam), Noah and Solomon are also referred to by symbols the tree of knowledge for Eden (Adam), the ark, dove and rainbow for Noah, and pillars for Solomon.