Unequal Bilateral Tolerance - A tolerance where the allowable variation is from the target value, and the variation is not the same in both directions.
Unilateral Tolerance - A tolerance where the allowable variation from the target value is all in one direction and zero in the other direction.
Variable Gage - A gage capable of providing a numerical reading of a part parameter.
Virtual Condition (VC) - A worst-case boundary generated by the collective effects of a feature of size specified at MMC or at LMC and the geometric tolerance for that material condition.