What does 'signatura' mean?

The 'signatura' or call number is the code that identifies the specific location of a document in the shelves. As a rule, it's made up of three or more digits representing the subject (according to the Universal Decimal Classification), the first three letters of the author's name and the first three letters os the title. You'll see this code in a label stuck on the spine of every document. When you find a document in the catalogue, you must take down this code in order to locate it.