  We discuss the extension of the superflavor symmetry of doubly heavy baryons
to states which contain an excited heavy diquark, and we examine some of the
consequences of this symmetry for the spectra of doubly heavy baryons and heavy
mesons. We explore the ramifications of a proposed symmetry that relates heavy
diquarks to doubly heavy mesons. We present a method for determining how the
excitation energy of a system containing two heavy quarks will scale as one
changes the strength of the interactions and the reduced mass of the system. We
use this to derive consequences of the heavy diquark-doubly heavy meson
symmetry. We compare these consequences to the results of a quark model as well
as the experimental data for doubly and singly heavy mesons. We also discuss
the possibility of treating the strange quark as a heavy quark and apply the
ideas developed here to strange hadrons.
