Tattoo (tattoo). A tattoo is a mark made by inserting pigment into the skin. In technical terms, a diagram is the implantation of micropigments. Diagrams can be made against human or animal skin. Diagrams in humans are a form of body modification, while diagrams in animals are generally used as identification. Tattoo comes from Tahiti, tatu which means is a sign. The tattoo in Mentawai language is titi. There is a slight difference in the sound of the origin of the word tattoo. While the function of tattoos in general is usually to signify someone who comes from a certain community or social class or to beautify themselves. Especially for the Mentawai tribe, tattoos have more than just social signs in their community. For them, tattoos or titi are a reflection of the close relationship between the Mentawai community and the surrounding environment.