Outer continental shelf.
Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Source: API RP 49, Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide, Third Edition, May 2001. Global Standards
Outer continental shelf (Gulf of Mexico).
Source: Deepwater Well Control Guidelines. IADC Guidelines
OCS means Outer Continental Shelf.
Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). Regulations