\documentclass{book}
\usepackage{amssymb,amsmath}
\usepackage[left=2.5cm,right=2.5cm,textheight=24cm,top=2cm]{geometry}
\usepackage{xtab}
\usepackage{xepersian}
\settextfont[Scale=1.3]{Yas}


\begin{document}\baselineskip=8mm
\begin{center}
%\begin{table}[htbp]
%\topcaption{The principal xtab package commands}
\tablefirsthead{\hline \multicolumn{4}{c}{جدول نمادهای ریاضی} \\ \hline }
\tablehead{\hline \multicolumn{4}{c}{ادامه از صفحه قبل} \\ \hline }
\tablelasthead{\multicolumn{4}{c}{} \\ }
\tabletail{\hline \multicolumn{4}{c}{ادامه در صفحه بعد} \\ \hline}
\tablelasttail{\hline \hline}
\begin{xtabular}{|l|r|l|r|} 
 \hline
% \begin{center}
 \verb+\leftarrow+         & $\leftarrow $         & \verb+\rightarrow+               & $\rightarrow $ \\
 \verb+\Leftarrow+           & $\Leftarrow $         &   \verb+\Rightarrow+                 & $\Rightarrow $  \\
 \verb+\leftrightarrow+      & $\leftrightarrow $    &   \verb+\Leftrightarrow+             & $ \Leftrightarrow$ \\
 \verb+\leftharpoonup+       & $\leftharpoonup $     &   \verb+\leftharpoondown+            & $\leftharpoondown $  \\
 \verb+\hookleftarrow+       & $\hookleftarrow $     &   \verb+\hookrightarrow+             & $\hookrightarrow $ \\
 \verb+\rightharpoonup+      & $ \rightharpoonup$    &   \verb+\rightharpoondown+           & $\rightharpoondown $  \\
 \verb+\uparrow+             & $\uparrow $           &   \verb+\downarrow+                  & $\downarrow $ \\
 \verb+\Uparrow+             & $\Uparrow $           &   \verb+\Downarrow+                  & $\Downarrow $  \\
 \verb+\updownarrow+         & $\updownarrow $       &   \verb+\Updownarrow+                & $\Updownarrow $ \\
 \verb+\leftleftarrows+      & $\leftleftarrows $    &   \verb+\rightrightarrows+           & $\rightrightarrows $  \\
 \verb+\twoheadleftarrow+    & $\twoheadleftarrow $  &   \verb+\twoheadrightarrow+          & $\twoheadrightarrow $ \\
 \verb+\leftrightarrows+     & $\leftrightarrows $   &   \verb+\rightleftarrows+            & $\rightleftarrows $  \\
 \verb+\leftarrowtail+       & $\leftarrowtail $     &   \verb+\rightarrowtail+             & $\rightarrowtail $ \\
 \verb+\Lleftarrow+          & $\Lleftarrow $        &   \verb+\Rrightarrow+                & $\Rrightarrow $  \\
 \verb+\looparrowleft+       & $\looparrowleft $     &   \verb+\looparrowright+             & $\looparrowright $ \\
 \verb+\leftrightharpoons+   & $\leftrightharpoons $ &   \verb+\rightleftharpoons+          & $\rightleftharpoons $  \\
 \verb+\curvearrowleft+      & $\curvearrowleft $    &   \verb+\curvearrowright+            & $\curvearrowright $ \\
 \verb+\circlearrowleft+     & $\circlearrowleft $   &   \verb+\circlearrowright+           & $\circlearrowright $  \\
 \verb+\upharpoonleft+       & $\upharpoonleft $     &   \verb+\upharpoonright+             & $\upharpoonright $ \\
 \verb+\dashleftarrow+       & $ \dashleftarrow$     &   \verb+\dashrightarrow+             & $\dashrightarrow $  \\
 \verb+\downharpoonleft+     & $\downharpoonleft $   &   \verb+\downharpoonright+           & $\downharpoonright $ \\
 \verb+ \Lsh+                      & $ \Lsh $              &   \verb+\Rsh+                        & $\Rsh $  \\
 \verb+\rightsquigarrow+     & $\rightsquigarrow$    &   \verb+\leftrightsquigarrow+        & $\leftrightsquigarrow $ \\
 \verb+\upuparrows+          & $\upuparrows $        &   \verb+\downdownarrows+             & $\downdownarrows $  \\
 \verb+\multimap+            & $\multimap $          &                        &   \\
 \verb+\nleftarrow+          & $\nleftarrow $        &   \verb+\nrightarrow+                & $\nrightarrow $  \\
 \verb+\nLeftarrow+          & $ \nLeftarrow $       &   \verb+\nRightarrow+                & $\nRightarrow $ \\
 \verb+\nleftrightarrow+  & $\nleftrightarrow $   &   \verb+\nLeftrightarrow+            & $\nLeftrightarrow $  \\ 
 \verb+\alpha+             & $\alpha $             &   \verb+\beta+                       & $\beta $ \\
 \verb+ \gamma+         & $ \gamma $            &   \verb+\delta+                      & $\delta $  \\
 \verb+\epsilon+          & $\epsilon $           &   \verb+ \varepsilon+                & $ \varepsilon $ \\
 \verb+\zeta+              & $ \zeta $             &   \verb+\eta+                        & $\eta $  \\
 \verb+\theta+            & $\theta $             &   \verb+\vartheta+                   & $\vartheta $ \\
 \verb+\iota+              & $\iota $              &   \verb+\kappa+                      & $\kappa $  \\
 \verb+\lambda+        & $ \lambda$            &   \verb+\mu+                         & $\mu $ \\
 \verb+\nu+               & $\nu $                &   \verb+ \xi+                        & $ \xi $  \\
 \verb+\tt{}o+                          & $ o$                  &   \verb+\pi+                         & $\pi $ \\
 \verb+\varpi+            & $\varpi $             &   \verb+\rho+                        & $\rho $  \\
 \verb+\varrho+          & $\varrho $            &   \verb+\sigma+                      & $\sigma $ \\
 \verb+\varsigma+       & $\varsigma $          &   \verb+\tau+                        & $\tau $  \\
 \verb+\upsilon+         & $\upsilon $           &   \verb+\phi+                        & $\phi $ \\
 \verb+\varphi+          & $\varphi $            &   \verb+\chi+                        & $\chi $  \\
  \verb+\psi+               & $\psi $               &   \verb+\omega+                      & $\omega $ \\
 \verb+\digamma+      & $\digamma $           &   \verb+\beth+                       & $\beth $  \\
 \verb+\gimel+               & $\gimel $             &   \verb+\daleth+                     & $\daleth $ \\ 
 \verb+\aleph+               & $\aleph $             &   \verb+\infty+                      &  $\infty $  \\
 \verb+\hbar+                & $\hbar $              &   \verb+\partial+                    & $ \partial$ \\
 \verb+\imath+             & $\imath $             &                         &   \\
 \verb+\ell+               & $\ell $               &   \verb+\jmath+                      & $\jmath $ \\
 \verb+\nabla+             & $ \nabla$             &   \verb+\wp+                         & $ \wp$  \\
 \verb+\forall+            & $\forall $            &   \verb+\triangle+                   & $\triangle $ \\
 \verb+\exists+            & $\exists $            &   \verb+\Re+                         & $\Re $  \\
 \verb+\Im+                & $\Im $                &   \verb+\neg+                        & $\neg $ \\
 \verb+\surd+              & $\surd $              &   \verb+\prime+                       & $ \prime$  \\
 \verb+\emptyset+          & $\emptyset $          &   \verb+\top+                        & $\top $ \\
 \verb+\bot+                 & $\bot $               &   \verb+\angle+                      & $ \angle$  \\
 \verb+\backslash+         & $\backslash $         &   \verb+\flat+                       & $ \flat$ \\
 \verb+\natural+           & $\natural $           &   \verb+\sharp+                      & $\sharp $  \\
 \verb+\|+                 & $\| $                 &   \verb+\clubsuit+                   & $\clubsuit $ \\
\end{xtabular} %
\end{center}
\end{document}