When reflecting a triangle, does Alpha, Beta, etc. have to be used as a designation?

The dissociation constant for KA(s) <-> K+(aq) + A-(aq) is defined as Kd = ([K+][A-])/[KA]. Concentrations usually refer to the amount of dissolved component, but this time we're talking about the concentration of KA, the undissolved component that is formed again in the reverse reaction. What exactly does that mean numerically? As stated in my…