We investigate the characteristics of zero-divisor graph of non-commutative ring. A set of relations on vertex set of directed graphs encloses the observations in the discussion. Annihilators play a vital role for the continuation. The idea of orthogonality is a prominent tool for our interpretation. Different directions are brought to attention in orthogonal condition. Orthogonality leads to the complemented graph. Some basic concepts of ring theory help to an extent.