'Wall' in the Bible

My lover is like a gazelle or a young stag. Look! There he stands behind our wall, gazing through the window, peering through the lattice.

If she is a wall, we will build on her a battlement of silver; but if she is a door, we will barricade her with boards of cedar.

The Beloved: I was a wall, and my breasts were like fortress towers. Then I found favor in his eyes.