Great question! While I am not entirely certain, as a language model, I believe that the term "rocket" is used to refer to arugula primarily in England, but it may also be used in other parts of the United Kingdom, such as Scotland and Wales, as well. However, it is worth noting that there may be regional variations in the names of different vegetables across the UK, so it's possible that different regions may have their own unique terms for arugula.
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