  The NICER Collaboration recently reported the measurement of the mass and
radius of a pulsar PSR J0030+0451. We here use this new measurement to
constrain one of the higher-order nuclear matter parameters
$K_{\mathrm{sym,0}}$. We further combine the tidal measurement of the binary
neutron star merger GW170817 by LIGO/Virgo to derive a joint 1-$\sigma$
constraint as $K_{\mathrm{sym,0}} = -102^{+71}_{-72}$ MeV. We believe this is
the most reliable bound on the parameter to date under the assumption that
there is no new physics above the saturation density which impacts neutron star
observations.
