Visto bueno, “seen and good,” often abbreviated Vo. Bo., is the approval that an authority or a superior gives to a document after reviewing it. That is how the Diccionario del español de México of El Colegio de México defines it.
At UNAM, the readers of a thesis give their verdict on a form titled voto aprobatorio, approving vote. The form offers two options, APROBATORIO and NO APROBATORIO.