noun
zoom box
In graphical user interfaces, a small control that lets the user zoom in or out on a view, or a rectangle drawn to select a zoom area.
画像編集ソフトでズームボックスをドラッグして拡大したい部分を選ぶ。
In image editing software, drag the zoom box to select the area you want to enlarge.
Variant with interpunct; less common in running text.
Borrowed from English 'zoom box'.