Any time there’s a discussion of the versatile light-emitting diode (LED), there’s sure to be a lot of acronyms thrown into the mix. And acronyms—unless you have a military background (Lima! Echo! Delta! Sierra!)—can sometimes confuse and befuddle. So, for the sake of this treatise on edge-lit acrylic signs, we’ll keep the acronyms to a minimum, perhaps only to the most important acronym of all: LED.