  We present the serendipitous discovery of (1) a large double radio relic
associated with the galaxy cluster PSZ2 G277.93+12.34 and (2) a new odd radio
circle, ORC J1027-4422, both found in the same deep MeerKAT 1.3 GHz wide-band
radio continuum image. The angular separation of the two arc-shaped cluster
relics is ~16 arcmin or ~2.6 Mpc for a cluster redshift of z ~ 0.158. The thin
southern relic, which shows several ridges/shocks including one possibly moving
inwards, has a linear extent of ~1.64 Mpc. In contrast, the northern relic is
about twice as wide, twice as bright, but only has a largest linear size of
~0.66 Mpc. Complementary SRG/eROSITA X-ray images reveal extended emission from
hot intracluster gas between the two relics and around the narrow-angle tail
(NAT) radio galaxy PMN J1033-4335 (z ~ 0.153) located just east of the northern
relic. The radio morphologies of the NAT galaxy and the northern relic, which
are also detected with the Australian Square Kilometer Array Pathfinder (ASKAP)
at 888 MHz, suggest both are moving in the same outward direction. The
discovery of ORC J1027-4422 in a different part of the same MeerKAT image makes
it the 4th known single ORC. It has a diameter of ~90 arcsec corresponding to
400 kpc at a tentative redshift of z ~ 0.3 and remains undetected in X-ray
emission. Supported by simulations, we discuss similarities between outward
moving galaxy and cluster merger shocks as the formation mechanisms for ORCs
and radio relics, respectively.
