SysML directed features displayed on Port symbols are often far clearer than UML-style provided/required Interface "ball (lollipop) and socket" notation

Icon class
icon_class
far fa-sticky-note
icon_class_computed
far fa-sticky-note
Note kind
DISPLAY
STYLE
Specification keywords
SysML-1.6
UML keywords
provided Interface
required Interface
ball-and-socket
InterfaceRealization
Usage
SysMLv1.x keywords
directed Feature
Relates to
Figure D.19 - Internal Structure of the Power Subsystem (Internal Block Diagram)
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