%% 
%%  Example 01-08-8 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}

%StartShownPreambleCommands
\usepackage{amsmath}% for \dfrac
\DeclareMathDelimiter{\Norm}{\mathord}{largesymbols}{"3E}{largesymbols}{"3E}
%StopShownPreambleCommands
\begin{document}
$\left\Norm *BLA* \right\Norm$ \qquad $\left\Norm \dfrac{*BLA*}{*BLUB*} \right\Norm$
\end{document}
