I think it's an indication of the engines flexibility. A torque monster which doesn't rev so hard for example a diesel engine will initially pickup well upon throttle application but the ability to continue to deliver the performance will drop off for various reasons. A high revving engine which has good top end power but not so torquey or one which has a narrow torque band which starts higher in the rev range will be the other way around, slow to get going but once it does it will storm home but by then the bull would be gone. The good turbo engines can deliver the best of both worlds, the FG inline 6 is a good example of a very flexible engine that has a wide torque range which starts fairly low in the rev range and also has the ablitiy to rev high and continue to deliver performance once the torque delivery has started to drop off in the higher rev range.
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