Hmn, the terminology is unknown to me. What does it mean?

[no, wait... cassius shakes his head, realizing that this is not the right question to ask. context is important, when they're not calling themselves that term, but the people of this world are. so it means something to them.

so he'll amend.]

Rather, what does it mean to the people of this world? What are we expected to do, that they call us that?