% --------------------------------------------------------------------------
% Signal Flag U:
% --------------------------------------------------------------------------
\begin{flagdescription}{1}
\SignalFlagColorDefinitions
\background{red}
\fill [white] (0.5\flaglength,0.5) rectangle (0,0);
\fill [white] (0.5\flaglength,0.5) rectangle (\flaglength,1);
\framecode{}
\end{flagdescription}