So I know all of the call signs used by Phoenix PD mean something. For example, a unit that clears with the call sign "sam" is a K9 officer. "tom" is the call sign used for a motor officer. There are others like "india" (two-man unit) that describe the car or officers and/or the shift they're riding. So my question: Does anyone know any others? I know there are many, many more, but I'm not familiar with all of them. I hear "x-ray" and "nora" units clearing all the time, but don't know what those signify. Any ideas on some other call signs and they're meanings?