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Reflected overpressure refers specifically to the impact of the transmitted blast wave after it strikes a surface and is reflected back, creating an increase in pressure at a particular point. This phenomenon often occurs in scenarios involving explosions, where the force of the blast wave can bounce off of buildings or other structures, resulting in a pressure measurement that reflects this peak pressure intensity.

The correct choice indicates that reflected overpressure is measured with a device pointed directly at the blast wave, capturing the intensity of the pressure immediately after the wave has impacted the measuring surface. This allows for a more accurate assessment of the overpressure experienced due to the blast.

Understanding reflected overpressure is crucial in fields related to safety and disaster response, as it helps to assess potential risks and damages in environments affected by explosions. The other options, while related to different pressures, do not address the specific nature of pressure measurement associated with reflected blast waves.