Tattoo lines on the arm generally refer to a specific type of tattoo style known as “liner work”. These tattoos are composed of bold, black lines that are often used to define the overall design of a tattoo. They are typically placed around the edges of a tattoo to outline the object or pattern within the design, and they may also be used to separate design elements from one another. The end result is an intricate and well-defined composition. Some popular examples of tattoos featuring lines on the arm include tribal designs, arm bands, and geometric patterns.