This is a stab wound with a single edge blade. Note the sharp point of the blade at the left and the notch of the opposite side of the knife at the right. The shape of stab wounds can vary considerably, depending upon whether the incision is along the axis of, or perpedicular to, Langer's lines. Those perpendicular will tend to pull apart and gape open, while those parallel to the lines of stress will tend to remain slit-like. [Image contributed by Todd Grey, MD, University of Utah]