Help - Meaning of the "x" by the side of Pins

Can someone explain me the meaning of the “x” that appears in some pins?


I noted that I can click on the “x”, that so disappears, but I don’t know what does it mean.

Probably just the reference’s implicit slots ( What’s the little x after a reference for? ).

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You’re absolutely rigth! I didn’t know about that “x” meaning, as it is not in the tutorials. Thanks for letting me know!