\[Dings=DADA+n\]
Dings= "DADA"+n
danke für eure Hilfe

\[Dings=DADA+n\]
\documentclass[11pt,a4paper]{scrartcl} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} \usepackage{amsmath} \begin{document} \[Dings=\text{\textquotedbl}\!DADA\text{\textquotedbl}+n\] \end{document}