Rev. 21:17
And he measured its wall, a hundred and forty-four cubits, according to the measure of a man, that is, of an angel.

144 is 12x12

Rev. 12:1
And a great sign was seen in heaven: a woman clothed with the sun, and the moon underneath her feet, and on her head a crown of twelve stars

12 tribes are written on the 12 gates of the New Jerusalem. 12 apostles make up the 12 foundations of the New Jerusalem.