'Twelve' in the Bible

It has a wall, massive and high, with twelve large gates, and in charge of the gates were twelve angels. And overhead, above the gates, names were inscribed which are those of the twelve tribes of the descendants of Israel.

The wall of the city had twelve foundation stones, and engraved upon them were twelve names--the names of the twelve Apostles of the Lamb.

The plan of the city is a square, the length being the same as the breadth; and he measured the city furlong by furlong, with his measuring rod--it is twelve hundred miles long, and the length and the breadth and the height of it are equal.

And the twelve gates were twelve pearls; each of them consisting of a single pearl. And the main street of the city was made of pure gold, resembling transparent glass.

On either side of the river, midway between it and the main street of the city, was the Tree of Life. It produced twelve kinds of fruit, yielding a fresh crop month by month, and the leaves of the tree served as medicine for the nations.