In some Star Trek games and other expanded-universe material, the Borg paired with the insignia seen in TNG's "Descent" episodes.
However, were those Borg actually part of the collective proper, or somehow isolated by Lore to use for his own ends? If the latter, was the insignia then something of Lore's design or properly Borg? I don't recall seeing that insignia on other TNG or VOY episodes.