Side light channel letters are a type of sign that utilizes both internal and external illumination. Typically made from metal, plastic, or acrylic, these letters are designed to be mounted to a building's exterior, making them visible from a distance. The unique characteristic of side light channel letters is their ability to emit light not only from the front but also from the sides, creating an attractive halo effect. This multidimensional lighting enhances visibility, especially during nighttime, effectively attracting customers' attention when they are most active.