'Wall' in the Bible

My beloved is like a roe or a young hart: behold, he standeth behind our wall, he looketh forth at the windows, shewing himself through the lattice.

If she be a wall, we will build upon her a palace of silver: and if she be a door, we will inclose her with boards of cedar.

I am a wall, and my breasts like towers: then was I in his eyes as one that found favour.