Cuneiform to left-to-right in horizontal rows (rotating all of the pictographs 90° counter-clockwise in the process) and a new wedge-tipped stylus was introduced which was pushed into the clay, producing wedge-shaped ("cuneiform") signs; these two developments made writing quicker and easier. By adjusting the relative position of the tablet to the stylus, the writer could use a single tool to make a variety of impressions. Cuneiform tablets could be fired in kilns to bake them hard, and so provide a permanent record, or they could be left moist and recycled, if permanence was not needed. Many of the clay tablets found
Zi (cuneiform) are interchangeable with each other. The "zi" sign usage in the "Epic of Gilgamesh" is as follows: "ze"-(6 times); "gi"-(46), "ZI"-(32 times). Zi (cuneiform) The cuneiform zi sign is a common multi-use sign of the "Epic of Gilgamesh", the 1350 BC Amarna letters, and other cuneiform texts. It also has a sumerogrammic usage for ZI in the "Epic of Gilgamesh". The structure of the cuneiform sign is like its twin, Gi (cuneiform), . The "zi" sign has the syllabic usage for "ze" and "zi", and a sumerogram usage for "ZI". Alphabetically "zi" can be used for "z" ("z" can be