Noun
window back (plural window backs)
The inside face of the low, and usually thin, piece of wall between the window sill and the floor below.
Tap "M" on your keyboard to select "Move" on the menu, and then use the keyboard arrow keys to reposition the window back to your desktop. Source: Internet
The espresso finish is featured on the lattice, ladder, and window back options and the cherry finish is featured on the scroll and solid back options. Source: Internet