This paper investigates prohibition texts at three German-speaking universities through the lens of linguistic landscape research. Photographic data collected at the University of Zurich, Ludwig Maximilian University of Munich, and Leuphana University of Lüneburg form the empirical basis of the study. Annotation and analysis of the material reveal both commonalities and differences in terms of spatial context, placement, materiality, mode of production, modality, and linguistic form. By comparing prohibition texts across institutional settings, the study provides insights into the ways in which institutional communication reflects and reinforces spatial, cultural, and social norms. The findings underscore the analytical value of a linguistically informed, multimodal approach to the study of public prohibition signage within and beyond academic environments. mehr