After the nuclei of oxygen O-16 and calcium Ca, which are the first and the second upper-order ones, the tin nucleus Sn is the third upper-order nucleus. Its structure is based on the successive conversions of iron Fe and nickel Ni-60 into tin nucleus Sn. From this third upper-order nucleus the fourth one is constructed (orion nucleus Or-307), as a forecast by the unified theory of dynamic space. The atomic numbers Z of the above four upper-order nuclei are the so-called four "magic numbers", i.e. Z1=8, Z2=8x2.5=20, Z3=20x2.5=50 and Z4=50x2.5=125, according to the mirror symmetry (Figs 4 and 5). It is noted that, this forecast of orion nucleus Or-307 with an atomic number Z4=125 is the corresponding "hypothetical unbihexium Ubh", whose the different atomic number is Z=126. However, the number Z4=125 looks symmetrical and not magical at all, due to the 2.5 factor.