Grant, I always use "K3S" and "K3", and add a lower case "s" for plural. If you look at the logo, yes, the trailing "S" is smaller than the "K3", but not small enough to be lower case (1/2 the height of the caps). 73, Don W3FPR On 6/27/2018 4:27 PM, Grant Youngman wrote: How the heck do you differentiate between plurals with this radio :-)