A LED letter sign is a three-dimensional sign element. It is fabricated from stainless steel and acrylic, thus it will not rust. LED letters are eye-catching and the most preferred choice when it comes to exterior signs. These signs are usually used as fixtures on parts of a building. LED letter signs enhance the overall look of the sign itself and add a lighting effect on the surrounding building façade. You can choose from different types of LED letters like standard LED letter, open face LED letter, Halo effect LED letter and black/white LED letter. Each type has its unique characteristics.