What is the characteristic murmur grade that is described as clearly audible?

The characteristic murmur grade that is described as clearly audible is Grade III. In the grading scale for heart murmurs, Grade III murmurs are easily heard with the stethoscope and are prominent in volume, yet they do not have the characteristics of being loud enough to thrill (an associated vibration felt on palpation) as seen in Grade IV murmurs.

Grade I murmurs are very faint and often not heard by inexperienced listeners, while Grade II murmurs are soft but can be heard by trained practitioners. Grade IV murmurs are notable for their loudness and are typically accompanied by a palpable thrill. Therefore, Grade III serves as a clear delineation in murmur intensity, representing a murmur that is clearly audible but lacks the extreme loudness and associated thrill found in Grade IV murmurs.