The mark consists of a black skull with an "S" shape that is white on the hollow part of the "S" shaped skull and the teeth of the "S" shaped skull are represented at the bottom of the "S" shaped skull with 4 vertical lines and one horizontal line, which represents the "S" in Sinister Ink; the black "I" shaped nose is slightly angled a bit past the middle and gives shape to the white hollowed eye socket, which represents the "I" in Sinister Ink.