Composite aggregation is a strong form of aggregation that requires a part object be included in at most one composite object at a time. If a composite object is deleted, all of its part instances that are objects are deleted with it.

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SysMLv1: A 'part property' in SysMLv1 does not formally include 'port' (which is considered a special kind of property), even though the Port metaclass in UML2 extends Property and a 'port' may have 'composite' aggregation and be typed by a Block.
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Property
Property::aggregation
AggregationKind::composite
part object
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Composite aggregation is a strong form of aggregation that requires a part object be included in at most one composite object at a time . If a composite object is deleted, all of its part instances that are objects are deleted with it.

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Aggregation type, navigability, and end ownership are separate concepts, each with their own explicit notation. Association ends owned by classes are always navigable, while those owned by associations may be navigable or not.
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A part may be shown by graphical nesting of a box symbol
A Port is a Property of an EncapsulatedClassifier that specifies a distinct interaction point between that EncapsulatedClassifier and its environment or between the Behavior of the EncapsulatedClassifier and its internal roles. Ports are connected by ...
A Port of an EncapsulatedClassifier is shown as a small square symbol. The Port symbol may be placed either overlapping the boundary of the rectangle symbol denoting that EncapsulatedClassifier or it may be shown inside the rectangle symbol.
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