Cell diagrams are a way of representing cells and the redox half reactions that take place in each half cell. The order in which the diagram is written from left to right ismetallic anode, single vertical line, ions present in the anode area, double vertical line (salt bridge), ions present in the cathode area, single vertical line, metallic cathode.Zn(s) | Zn2+(aq) || Cu2+(aq) | Cu(s)