Gaussian 03 Online Manual
Energies, "analytic" gradients and numerical frequencies.
The energy appears in the output file as follows (followed by the x, y, and z components of the dipole moment):
Huckel eigenvalues -- -1.245 -0.637 -0.558 -0.544 -0.043 0.352 Energy= -5.968836513622 NIter= 0. Dipole moment= 0.000000 0.000000 0.000000
The energy is as defined by this semi-empirical model. Note that energy differences computed from the values in semi-empirical calculations are in Hartrees and may be compared directly with energy differences computed from jobs using other methods.