'Union' in the Bible

So I [Zechariah] pastured the flock doomed for slaughter, truly [as the name implies] the most miserable of sheep. And I took two [shepherd’s] staffs, the one I called Favor (Grace) and the other I called Union (Bonds); so I pastured the flock.

Then I broke my second staff, Union, into pieces to break the brotherhood between Judah (the Southern Kingdom) and Israel (the Northern Kingdom).