The centers of giant galaxies display stellar mass deficits(Mdef)which are thought to be a signature left by inspiraling supermassive black holes from pre-merged galaxies.We quantify these deficits using the core-Sersic model for the largest ever sample of early-type galaxies and find Mdef ∝M(3.7±0.8)BH with Mdef~0.5 to 4MBH,BH(black hole mass).We find that lenticular disc galaxies with bulge magnitudesMV <-21.0 mag also have central stellar deficits,suggesting that their bulges may have formed from major merger events while their surrounding disc was subsequently built up,perhaps via cold gas accretion scenarios.Interestingly,these bulges have sizes and mass densities comparable to the compact galaxies found at z~1.5 to 2.