A part may be shown by graphical nesting of a box symbol

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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.
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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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A part may be shown by graphical nesting of a box symbol. A role that is not a composition may be shown by graphical nesting of a box symbol with a dashed outline. In either case the box may be called a part box, even though strictly-speaking only the compositions are parts.

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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.
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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