'Wall' in the Bible

My beloved is like a gazelle or a young hart. Behold, he standeth behind our wall, He looketh in through the windows, Glancing through the lattice.

If she be a wall, We will build upon her a turret of silver; And if she be a door, We will enclose her with boards of cedar.

I am a wall, and my breasts like towers; Then was I in his eyes as one that findeth peace.