'Wall' in the Bible

My beloved is like a gazelle or a young stag. Look, there he stands behind our wall, looking through the windows, gazing through the lattice.

If she's a wall, on her we will build a battlement of silver. If she's a door, we will enclose her with planks of cedar.

I was a wall and my breasts were like towers. Then I became like one who finds peace in his eyes.