The VMs illustration is clearly a 'four-way' diagram, not a 'three-way' diagram. Assuming "father, son, and holy ghost', what is the 'fourth' way that is relevant to the time of the C-14 dates? The obvious answer has to be the 'Virgin Mary'. There have been various prior suggestions of disguised Mariology, from VMs Virgo and the Virgin to the Moon inside the Wreath of the Virgin.
If there is a letter 'U', perhaps it is for the Latin 'uxor' which is 'wife'. Granted, the idea of the "wife" of God may lean a bit heretical in some circles, particularly in retrospect. However, no one can say that the VMs is a bastion of orthodoxy and there already are various indications of VMs trickery. Perhaps it takes an unusual illustration to depict an unexpected ideology.
If there is a letter 'U', perhaps it is for the Latin 'uxor' which is 'wife'. Granted, the idea of the "wife" of God may lean a bit heretical in some circles, particularly in retrospect. However, no one can say that the VMs is a bastion of orthodoxy and there already are various indications of VMs trickery. Perhaps it takes an unusual illustration to depict an unexpected ideology.