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\usepackage{amsthm,amssymb,amsmath,mathabx} 
\usepackage{multicol}
\usepackage{xepersian}
\settextfont[Scale=1.1]{XB Niloofar}

\begin{document} 
  
 \فصل*{فهرست نمادها}
\renewcommand{\chaptermark}[1]{\markboth{\MakeUppercase{\ #1}}{\MakeUppercase{\ #1}}}
\addcontentsline{toc}{part}{فهرست نمادها}
\chaptermark{فهرست نمادها} 

\begin{multicols}{2}
\begin{supertabular}{lrr}

${\Bbb R},$ & & \pageref{R}\\\\\\\\\\

$ +\infty $& & \pageref{infty}\\\\\\\\\\\\

$ {\Bbb N} $& & \pageref{N}\\\\\\\\\\\\

$  {\Bbb Z} $& & \pageref{Z}\\\\\\\\\\\\

$ {\Bbb Q}$& & \pageref{Q}\\\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

$ a $& & \pageref{a}\\\\\\\\\\

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\end{document}