Accusative case
For example, in Latin. "The man sees the woman" = "Vir feminam videt", while "The woman sees the man" = "Femina virum videt". For "man", Latin uses "vir" for the subject, and "virum" for the object. Also, in the same sentences, we have "femina" for a subject and "feminam" for object. The form used for the direct object ("him", "virum", "feminam") is known as the "accusative case", while the form used for the subject ("he", "vir", "femina") is known as the nominative case.