Erfi
From specialfunctionswiki
The imaginary error function $\mathrm{erfi}$ is defined by $$\mathrm{erfi}(z)=-i\mathrm{erf}(iz),$$ where $\mathrm{erf}$ denotes the error function.
Graph of $\mathrm{erfi}$.
Domain coloring of $\mathrm{erfi}$.
