Linguistic descriptions of sign languages are important to the recognition of their linguistic status. These languages are an essential part of the cultural heritage of the communities that create and use them and vital in the education of deaf children. They are also the reference point in language acquisition studies. Ours is exploratory research, and its conclusions are preliminary because of the scarcity of previous studies about the subsystem of numerals in Catalan Sign Language (LSC). Nevertheless, we hope it will provide a useful base for future research on this aspect of LSC and other sign languages.