Upper Palaeolithic hand stencils at Cosquer Cave have been interpreted as forming a numeric code. The present analysis examined ‘digits’ at Cosquer and Gargas from the perspectives of modern ethnography, shared cognitive functioning and human hand anatomy, concluding that correspondences between the 27,000-year-old hand stencils and modern finger-counting practices, including the use of so-called biomechanically infeasible hand positions, are unlikely due to chance; thus, the hand stencils may indeed represent integers. Images of finger-signs may provide an additional avenue for interpreting Palaeolithic quantification.