Runout.... Assuming that you rotate the surface "A" on the v-block
If the dial indicator is zeroed and remains at a single measuring location while rotating 360 degrees - Circular Runout
If the the dial indicator is zeroed then moved from one end of the small diameter to the other while rotating on surface "A" and measuring all surface locations - Total Runout.
Be aware that the v-block can introduce measurement error into either runout measurement method/definition.