The initialism OCL can have several meanings, depending on context: ...
abbreviation: Obstacle Clearance Limits
(In topic `Tools, Methods & Processes`) OCL (The Object Constraint Language) is a subset of the Unified Modeling Language. . As its name implies, it is the expression language for the UML that allows software developers to specify all types of constraints over the objects in the model. (see UML)
Object Constaint Language + Operation Control Language + Operator Control Language