What does SGBD mean?

SGBD also applies for Spanish: Sistema de Gestion de Bases de Datos.

SGBD might also mean "Sistema de Gestão de Banco de Dados" in Portuguese. Literally, "Database Management System", our good old DBMS.

A SGBD is a "Système de Gestion de Base de Données" which is exactly the same as a DBMS. I can't say much more since there are no great translation subtlety.

Yes you're right, I confirm that in French we use the abbreviation SGBD for 'Système Gestion de Base de Données' (DataBase Management System / DBMS) to which we can sometimes add R (SGBDR) 'Système Gestion de Base de Données Relationnelle' (RDBMS).