Número de chamada: estudo das práticas adotadas nas bibliotecas universitárias federais brasileiras

The research aimed to analyse the practices used in Brazilian university libraries, identifying the elements used in the construction of the call number, looking for similarities in their choices and ways of using them, as well as adherence with the literature in the area. This is a qualitative descriptive research combined with quantitative, using a questionnaire to collect data, via email, through Google forms. The accidental non-probabilistic sample was used, that is, the 26 libraries that answered the questionnaire were considered, which corresponds to 38,24% of the total of 68 Brazilian federal universities. The responses obtained showed that the composition of the call number is diverse, with reduced convergence in terms of similarities in the practices adopted, as well as some compatibility with the specialized literature in the area, which indicates the need for further studies.