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Is this a 18-electron aromatic system? No, because as the OP says in the question, the rings are not in a single plane. Is this compound considered aromatic? Yes, because it has three aromatic rings, as the OP stated. They all have 6 delocalized electrons, so they conform to the $4n + 2$ rule. "What if" all carbon atoms were in a plane? The C14 and ...