Due to adding a pole at s = 0, the angle of shifting in the Nyquist plot of the system will be a shift of 90° clockwise.
Due to adding a zero at s = 0, the angle of shifting in the Nyquist plot of the system will be a shift of 90° anticlockwise.
The shapes of the Nyquist plot for different transfer functions are given below.
Type/Order 
The shape of the Nyquist plot 
Type 0, order 1 \(G\left( s \right)=\frac{1}{1+sT}\) 

Type 0, order 2 \(G\left( s \right)=\frac{1}{\left( 1+Ts \right)\left( 1+{{T}_{2}}s \right)}\) 

Type 1, order 1 \(G\left( s \right)=\frac{1}{s}\) 

Type 1, order 2 \(G\left( s \right)=\frac{1}{s\left( 1+Ts \right)}\) 
