Term: Outer Boundary
OB 
Definition: A worst-case boundary generated by the collective effects of the largest feature of size (LMC for an internal feature of size, MMC for an external feature of size) and the applicable geometric tolerance.
Citation: ASME Y14.5 : Dimensioning and Tolerancing
See Also:
Feature of Size, Least Material Condition, Maximum Material Condition, Geometric Element, Tolerance