'Twelve' in the Bible

It stood on twelve oxen, three facing the north, three facing west, three facing south and three facing east; and the sea was set on top of them and all their hindquarters turned inwards.

and the one sea with the twelve oxen under it.

Twelve lions were standing there on the six steps on the one side and on the other; nothing like it was made for any other kingdom.

Manasseh was twelve years old when he became king, and he reigned fifty-five years in Jerusalem.