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Bug 2127 (2125) is fixed. I added additional column with standard HTNL entities. The better way to use them in problems. In this case software will automatically find the best way to write symbols for the different targets.

\label{Other_Symbols}

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 If you are viewing this online,  
 copy and paste the text on any of the 
 right columns into your text area to get
 the symbol on the left.

\begin{tabular}{|l|l|}
\hline
Symbol & HTML entity & Copy this column \\
\hline
$\pm$ & \verb+&plusmn;+ or \verb+&#177;+ & \verb+<m>$\pm$</m>+ \\
$\times$ & \verb+&times;+ or \verb+&#215;+ & \verb+<m>$\times$</m>+ \\
$\div$ & \verb+&divide;+ or \verb+&#247;+ & \verb+<m>$\div$</m>+ \\
$\cdot$ & \verb+&middot;+ or \verb+&#183;+ & \verb+<m>$\cdot$</m>+ \\
$\star$ &  & \verb+<m>$\star$</m>+ \\
$\circ$ & \verb+&deg;+ or \verb+&#176;+ & \\
$\bullet$ & \verb+&#149;+  & \verb+<m>$\bullet$</m>+ \\
$\dag$ &  & \verb+<m>$\dag$</m>+ \\
$\ddag$ &  & \verb+<m>$\ddag$</m>+ \\
$\dagger$ & \verb+&#134;+ & \verb+<m>$\dagger$</m>+ \\
$\ddagger$ & \verb+&#135;+ & \verb+<m>$\ddagger$</m>+ \\
$\copyright$ & \verb+&copy;+ or \verb+&#169;+ & \verb+<m>$\copyright$</m>+ \\
$\leq$ & \verb+&le;+ or \verb+&#8804;+ & \verb+<m>$\leq$</m>+ \\
$\geq$ & \verb+&ge;+ or \verb+&#8805;+ & \verb+<m>$\geq$</m>+ \\
$\neq$ &  & \verb+<m>$\neq$</m>+ \\
$\ll$ &  & \verb+<m>$\ll$</m>+ \\
$\gg$ &  & \verb+<m>$\gg$</m>+ \\
$\simeq$ &  & \verb+<m>$\simeq$</m>+ \\
$\perp$ & \verb+&perp;+ or \verb+&#8869;+ & \verb+<m>$\perp$</m>+ \\
$\parallel$ &  & \verb+<m>$\parallel$</m>+ \\
$\leftarrow$ & \verb+&larr;+ or \verb+&#8592;+ & \verb+<m>$\leftarrow$</m>+ \\
$\Leftarrow$ & \verb+&lArr;+ or \verb+&#8656;+ & \verb+<m>$\Leftarrow$</m>+ \\
$\rightarrow$ & \verb+&rarr;+ or \verb+&#8594;+ & \verb+<m>$\rightarrow$</m>+ \\
$\Rightarrow$ & \verb+&rArr;+ or \verb+&#8658;+ & \verb+<m>$\Rightarrow$</m>+ \\
$\uparrow$ & \verb+&uarr;+ or \verb+&#8593;+ & \verb+<m>$\uparrow$</m>+ \\
$\Uparrow$ & \verb+&uArr;+ or \verb+&#8657;+ & \verb+<m>$\Uparrow$</m>+ \\
$\leftrightarrow$ & \verb+&harr;+ or \verb+&#8596;+ & \verb+<m>$\leftrightarrow$</m>+ \\
$\Leftrightarrow$ & \verb+&hArr;+ or \verb+&#8660;+ & \verb+<m>$\Leftrightarrow$</m>+ \\
$\surd$ & \verb+&radic;+ or \verb+&#8730;+ & \verb+<m>$\surd$</m>+ \\
$\partial$ & \verb+&part;+ or \verb+&#8706;+ & \verb+<m>$\partial$</m>+ \\
$\sum$ & \verb+&sum;+ or \verb+&#8721;+ & \verb+<m>$\sum$</m>+ \\
$\int$ & \verb+&int;+ or \verb+&#8747;+ & \verb+<m>$\int$</m>+ \\
$\infty$ & \verb+&infin;+ or \verb+&#8734;+ & \verb+<m>$\infty$</m>+ \\
\hline
\end{tabular}