Symmetry tests in polarised Z0 decays to b bbar g Angular asymmetries have been measured in polarized Z0 decays to b-bbar-g collected by the SLD experiment at the SLC. A high purity b-bbar-g event sample is selected utilizing lifetime information given by the SLD CCD pixel vertex detector and the stable micron-size SLC beams, and the b- and bbar-jets are identified using lifetime information and momentum-weighted track charge. Forward-backward asymmetries are measured for two parity-violating observables, the b-jet polar angle and the angle between the quark-gluon and quark-electron planes, to test QCD. Two angular correlations between the three-jet plane and the Z0 polarization are studied. The CP-even and T-odd angular asymmetry, and the CP-odd and T-odd angular asymmetry are sensitive to physics beyond the Standard Model. We measure the expectation values of these quantities to be consistent with zero and set limits on the correlations at the 5% level.