'Singling out' is a privacy concept that refers to the ability to isolate an individual's data within a dataset, posing a significant privacy risk. This concept challenges the effectiveness of anonymisation techniques, as it highlights the potential for re-identification, even in seemingly de- identified data. The idea of 'singling out' is particularly relevant in the context of legal privacy standards, where the protection of individual identities is paramount. Addressing this issue requires a nuanced understanding of both the technical aspects of data processing and the legal definitions of privacy.