14 Here καί (kai) has not been translated because of differences between Greek and English style.
15 Some translations consider the word μυστήριον (mustērion, “mystery”) a part of the name written (“Mystery Babylon the Great,” so , ), but the gender of both ὄνομα (onoma, “name”) and μυστήριον are neuter, while the gender of “Babylon” is feminine. This strongly suggests that μυστήριον should be understood as an appositive to ὄνομα (“a name, i.e., a mystery”).

In other versions

And on her forehead was written a name of mystery: “Babylon the great, mother of prostitutes and of earth’s abominations.”

The name written on her forehead was a mystery:

babylon the great

the mother of prostitutes

and of the abominations of the earth.

On her forehead was written a name, a mystery: Babylon the Great, the Mother of Prostitutes and of the Detestable Things of the Earth.

A mysterious name was written on her forehead: “Babylon the Great, Mother of All Prostitutes and Obscenities in the World.”

And on her forehead a name was written, a mystery: “Babylon the great, the mother of prostitutes and of the detestable things of the earth.”

And upon her forehead was a name written, MYSTERY, BABYLON THE GREAT, THE MOTHER OF HARLOTS AND ABOMINATIONS OF THE EARTH.

Public Domain