'Twelve' in the Bible

The covered way was twenty cubits long and twelve cubits wide, and they went up to it by ten steps; and there were pillars by the uprights, one on one side and one on the other.

And the altar shall be twelve cubits long, twelve broad, square in the four squares thereof.

Thus saith the Lord GOD; This shall be the border, whereby ye shall inherit the land according to the twelve tribes of Israel: Joseph shall have two portions.