I am trying to compile my thesis in Latex and am getting multiple errors for my tables. The error I get says" Latex Error: Illegal character in array arg. My table look like the one below:
\begin{table}[h]
\centering
\begin{tabular}{||{2 cm}||{8 cm}||}
\hline
\multicolumn{2}{|c|}{Internal Combustion Engine Operating Speeds} \\
\hline
Number of Cylinders & Engine Speed\\
\hline
1 & 2500 rev/min \\
\hline
$>$ 1 & 1500 rev/min \\
\hline
\end{tabular}
\caption{Internal Combustion Engine Operating Speeds. }
\label{tab:Engine}
\end{table}
can anyone help please
Thanks
Max