It is assumed that the not numerous pairs of galaxies separated by about 150 Mpc appeared due to the baryon acoustic oscillations (BAO). We can use this distance as the standard ruler in cosmology. On the other hand, the Scale-Symmetric Theory (SST) shows that the four succeeding phase transitions of the modified Higgs field lead to the cosmic object/Protoworld which was created after the inflation but before the expansion of the Universe. The Protoworld appeared due to fluctuations in the Einstein spacetime - at first there was produced a vortex with left internal helicity. Due to the quantum entanglement, the internal structure of the Protoworld leaked to the Einstein spacetime. It caused that in the Einstein spacetime, already before the expansion of the Universe, there appeared virtual structures and flows which mimicked the structure and characteristic motions in the Protoworld. Such ordered motions in the Einstein spacetime decrease local pressure so there appears the attraction and quantum entanglement between the virtual structures and visible matter. Most important for creation of the cosmological rulers were the virtual cosmological loops produced by the Protoworld in its d = 1 state which is an analog to the d = 1 state in baryons. Calculated here the radius of such cosmological loops is 151.13 Mpc and such is the true origin of the standard ruler in cosmology. Obtained theoretical result is consistent with observational facts.