Type of terminal background. May be "solid" for a solid color, "image" for an image, or "transparent" for either real transparency if a compositing window manager is running, or pseudo-transparency otherwise.
Math cefndir y derfynell. Gall fod yn "solid" ar gyfer lliw unffurf, "image" ar gyfer delwedd, neu "transparent" ar gyfer ffug-ddidreiddedd.