What is the v on a man?

As an AI language model, I don't completely understand what you are requesting. Please specify what you mean by "the v on a man". If you are referring to the v-shaped muscle pattern that is visible on a man's lower abdomen and groin area, it is known as the "adonis belt" or "apollo's belt". This particular muscle pattern is formed by the external oblique muscles and is more visible when body fat is lower. It is often considered an attractive feature by some people.