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This tag should be applied to questions about structural diagrams - diagrams used to show the crude location of possible existent bonds and lone pairs of electrons in a chemical species. Do not use this tag if your question is about Lewis structures, use [lewis-structures] instead.

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What does this curve over the C-B bond mean?

I have come across this notation in a question I am trying to answer and am unsure of what exactly it means, can anyone clarify what this represents?
OhNoItsJoe's user avatar