Josephson Junctions: Difference between X and X enclosed by box (☒), in circuit diagrams?

Question

In circuit diagrams, Josephson Junctions are sometimes given as an X and sometimes as an X with a box around it ☒. What is the difference?

Personal preference of the creators? JJs are not common enough items to have their own "official" schematic symbol — PlasmaHH, Commented Jun 29, 2018 at 6:31
You would quickly run out of symbols when you gave everything one. It only makes sense for the most common things, not for a device that the majority of EEs never saw and probably even heard of. — PlasmaHH, Commented Jun 29, 2018 at 8:23
in circles its often a lightbulb or a resistive load. NC pins are sometimes marked with Xs. In research I often see special sensors as just a box with an X (though its probably meant more as a box with diagonal lines). — PlasmaHH, Commented Jun 29, 2018 at 8:30
@user1271772 Use any symbol you want, just make sure the target schematic reader understands what it is. You could place a blue circle inside a red hexagon, just as long as there is descriptive text that says "this is a Josephson Junction". I bet the references where you've seen an X tell you what the X means or make it obvious to infer from context. If you are writing an academic work, use the same symbol as the most relevant reference. — Vicente Cunha, Commented Jun 29, 2018 at 16:34

Nike Dattani · Accepted Answer · 2018-06-29 21:23:42Z

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It turns out there actually is a difference for Josephson junctions:

answered Jun 29, 2018 at 21:23

Nike Dattani

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