A compartment with the label “receptions” may appear as part of a block definition to show signal receptions. The “«signal»” keyword is optional in this compartment. Source OMG Systems Modeling Language (SysML) 1.6
All ports and nested ports (i.e., proxy, full, and ports with no stereotype applied), and their type definitions (e.g., interface blocks, blocks) can include compartments with textual and graphical representations to display their features ... Source OMG Systems Modeling Language (SysML) 1.6
Ports are specialized kinds of properties, and can be shown in same way as other properties. They can appear in block compartments in the same format as other properties of their owning blocks, or as the ends of associations, with the port appearing ... Source OMG Systems Modeling Language (SysML) 1.6
Ports that are not proxy or full can appear in block compartments labeled ports. Source OMG Systems Modeling Language (SysML) 1.6