A Pierringer release or Pierringer Agreement is a type of Settlement Agreement. The origin of the case is Pierringer v. Hogan.
Pierringer release Wikipedia
it has the following features:the settling defendant’s liability is segregated
the satisfaction of the settling defendant’s liability to the credit of all parties to the litigation
the plaintiff’s ability to continue with the action against the remaining defendants
the plaintiff’s agreement that it will indemnify the settling defendant for any contribution sought from it by the non-settling defendant(s).