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SysML also supports properties with shared aggregation, as shown by a white diamond symbol on an association.

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Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
AggregationKind::shared
AggregationKind
Association
Property
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SysML also supports properties with shared aggregation, as shown by a white diamond symbol on an association.
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Like UML, SysML defines no specific semantics or constraints for properties with shared aggregation, but particular models or tools may interpret them in specific ways.
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A property typed by a Block that does not have composite aggregation is classified as a reference property.
The supported variety of notations for associations and association annotations has been reduced to simplify the burden of teaching, learning, and interpreting SysML diagrams for the systems engineering user.
Notational and metamodel support for n-ary associations and qualified associations has been excluded from SysML.
The use of navigation arrowheads on an association has been simplified by excluding the case of arrowheads on both ends, and requiring that such an association always be shown without arrowheads on either end.
An “X” on a single end of an association to indicate that an end is not navigable has similarly been dropped, as has the use of a small filled dot at the end of an association to indicate that the end is owned by the associated classifier.
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