Term for the product of two axes?

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I was searching for an unrelated factoid the other day and came across a term which was defined roughly to mean the product of quantities described by two axes. For example, in a distance vs time graph it would be distance x time. It may have been referring to the area under the graph, but it is not the anti-derivative, integral, or Reimann sum. I believe the context was physics-related. Thank you for your help!