A sign cabinet, also known as a sign box or lightbox, is a type of outdoor signage typically used for commercial purposes. It is a rectangular or square-shaped enclosure made from metal, aluminum, or other sturdy materials. The sign cabinet houses one or more sign faces, which can be made from various materials like acrylic, polycarbonate, or flex face material.

The primary characteristic of a sign cabinet is its illumination feature. Inside the enclosure, there are light sources such as fluorescent tubes, LED modules, or neon lights that provide backlighting to the sign face. This makes the sign visible and attractive during the day and especially at night when the lights help it stand out.

The sign face itself may display text, graphics, logos, or any other promotional content, making it an effective advertising tool for businesses, especially when they operate during nighttime hours or want to increase visibility in low-light conditions.

Sign cabinets are commonly used for building signs, storefronts, pylon signs, and other outdoor advertising applications. They are durable, weather-resistant, and can be customized to fit specific branding needs, making them popular choices for businesses looking to enhance their visibility and brand recognition.