Bar orders are used in class actions when there are multiple defendants and some of these defendants want to settle. A bar order is included in the court's order approving the settlement. It prevents the non-settling defendants from making claims against the settling defendants.
An example of "bar order" language can be found in a Supreme Court Order dated July 19, 2001 in Killough v. Canadian Red Cross, Vancouver Registry C976108. See paragraphs 30 to 33. A copy may be obtained from the Vancouver Courthouse Library; order via the Unreported Decisions Index.
References
Class Actions Law and Practice, paras 9.30 to 9.31.1 (available in the Vancouver and Kelowna Courthouse libraries)