\documentclass{book}
\usepackage{amssymb}
\usepackage[utf8]{inputenc}
\usepackage{fontenc}
\usepackage{xepersian}
\settextfont[Scale=1]{XB Zar}
%\settextfont[Scale=1]{Neirizi}
\setdigitfont{XB Zar}
\defpersianfont\alaem{ALAEM}
\begin{document}
امام حسین
{\alaem\inputencoding{\char"0035}}
فرمود
\end{document}