  The LIGO-Virgo collaboration detection of the binary neutron-star merger
event, GW170817, has expanded efforts to understand the Equation of State (EoS)
of nuclear matter. These measurements provide new constraints on the overall
pressure, but do not elucidate its origins, by not distinguishing the
contribution to the pressure from symmetry energy which governs much of the
internal structure of a neutron star. By combining the neutron star EoS
extracted from the GW170817 event and the EoS of symmetric matter from
nucleus-nucleus collision experiments, we extract the symmetry pressure, which
is the difference in pressure between neutron and nuclear matter over the
density region from 1.2$\rho_{0}$ to $4.5\rho_{0}$. While the uncertainties in
the symmetry pressure are large, they can be reduced with new experimental and
astrophysical results.
