A relation between parameters and entities. It allows to assert generic constraints (encoded as parameters), e.g. MinimumAgeForDriving isConstraintFor John (where John is a legal subject under the TrafficLaw).
The intended semantics (not expressible in OWL) is that a Parameter isConstraintFor and Entity if the Parameter isParameterFor a Concept that classifies that Entity; moreover, it entails that a Parameter parametrizes a Region that isRegionFor that Entity. The use in OWL is therefore a shortcut to annotate what Parameter constrains what Entity