V:

I wince every time I hear the Visitors called “Vees.” The V spray paint logo is a resistance sign. And “Visitors” is already a euphemism - no need to shorten it to the awkward-sounding “Vees.”

And Fifth Column is a reference to the Spanish Civil War. In the original, the rebel Visitors were initially described by Martin a “a Fifth Column” and took their name from there. But on the new show, they seem to have named themselves “The Fifth Column.” Those rebel Visitors must be history buffs. Or maybe they’ve been around Earth long enough to have fought against Franco.