(i) The above symbol represents that the two wires are not joined. As shown in the figure below.

Such symbol is used when there are two or more wires in the circuit.

(ii) The above symbol represents the Rheostat or variable resistance as Shown in figure below.

The Rheostat is used when there is need to vary the current or resistance in the circuit. The original rheostat used in the circuit is shown below in the figure below.