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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.

    1: \label{Other_Symbols}
    2: 
    3: %
    4: 
    5:  If you are viewing this online,  
    6:  copy and paste the text on any of the 
    7:  right columns into your text area to get
    8:  the symbol on the left.
    9: 
   10: \begin{tabular}{|l|l|}
   11: \hline
   12: Symbol & HTML entity & Copy this column \\
   13: \hline
   14: $\pm$ & \verb+&plusmn;+ or \verb+&#177;+ & \verb+<m>$\pm$</m>+ \\
   15: $\times$ & \verb+&times;+ or \verb+&#215;+ & \verb+<m>$\times$</m>+ \\
   16: $\div$ & \verb+&divide;+ or \verb+&#247;+ & \verb+<m>$\div$</m>+ \\
   17: $\cdot$ & \verb+&middot;+ or \verb+&#183;+ & \verb+<m>$\cdot$</m>+ \\
   18: $\star$ &  & \verb+<m>$\star$</m>+ \\
   19: $\circ$ & \verb+&deg;+ or \verb+&#176;+ & \\
   20: $\bullet$ & \verb+&#149;+  & \verb+<m>$\bullet$</m>+ \\
   21: $\dag$ &  & \verb+<m>$\dag$</m>+ \\
   22: $\ddag$ &  & \verb+<m>$\ddag$</m>+ \\
   23: $\dagger$ & \verb+&#134;+ & \verb+<m>$\dagger$</m>+ \\
   24: $\ddagger$ & \verb+&#135;+ & \verb+<m>$\ddagger$</m>+ \\
   25: $\copyright$ & \verb+&copy;+ or \verb+&#169;+ & \verb+<m>$\copyright$</m>+ \\
   26: $\leq$ & \verb+&le;+ or \verb+&#8804;+ & \verb+<m>$\leq$</m>+ \\
   27: $\geq$ & \verb+&ge;+ or \verb+&#8805;+ & \verb+<m>$\geq$</m>+ \\
   28: $\neq$ &  & \verb+<m>$\neq$</m>+ \\
   29: $\ll$ &  & \verb+<m>$\ll$</m>+ \\
   30: $\gg$ &  & \verb+<m>$\gg$</m>+ \\
   31: $\simeq$ &  & \verb+<m>$\simeq$</m>+ \\
   32: $\perp$ & \verb+&perp;+ or \verb+&#8869;+ & \verb+<m>$\perp$</m>+ \\
   33: $\parallel$ &  & \verb+<m>$\parallel$</m>+ \\
   34: $\leftarrow$ & \verb+&larr;+ or \verb+&#8592;+ & \verb+<m>$\leftarrow$</m>+ \\
   35: $\Leftarrow$ & \verb+&lArr;+ or \verb+&#8656;+ & \verb+<m>$\Leftarrow$</m>+ \\
   36: $\rightarrow$ & \verb+&rarr;+ or \verb+&#8594;+ & \verb+<m>$\rightarrow$</m>+ \\
   37: $\Rightarrow$ & \verb+&rArr;+ or \verb+&#8658;+ & \verb+<m>$\Rightarrow$</m>+ \\
   38: $\uparrow$ & \verb+&uarr;+ or \verb+&#8593;+ & \verb+<m>$\uparrow$</m>+ \\
   39: $\Uparrow$ & \verb+&uArr;+ or \verb+&#8657;+ & \verb+<m>$\Uparrow$</m>+ \\
   40: $\leftrightarrow$ & \verb+&harr;+ or \verb+&#8596;+ & \verb+<m>$\leftrightarrow$</m>+ \\
   41: $\Leftrightarrow$ & \verb+&hArr;+ or \verb+&#8660;+ & \verb+<m>$\Leftrightarrow$</m>+ \\
   42: $\surd$ & \verb+&radic;+ or \verb+&#8730;+ & \verb+<m>$\surd$</m>+ \\
   43: $\partial$ & \verb+&part;+ or \verb+&#8706;+ & \verb+<m>$\partial$</m>+ \\
   44: $\sum$ & \verb+&sum;+ or \verb+&#8721;+ & \verb+<m>$\sum$</m>+ \\
   45: $\int$ & \verb+&int;+ or \verb+&#8747;+ & \verb+<m>$\int$</m>+ \\
   46: $\infty$ & \verb+&infin;+ or \verb+&#8734;+ & \verb+<m>$\infty$</m>+ \\
   47: \hline
   48: \end{tabular}