Thin diagonal line falling from upper left to lower right, a backslash shape used in box drawing and text-mode ASCII art borders.
U+2571BOX DRAWINGS LIGHT DIAGONAL UPPER RIGHT TO LOWER LEFTU+2573BOX DRAWINGS LIGHT DIAGONAL CROSSU+2570BOX DRAWINGS LIGHT ARC UP AND RIGHTU+2574BOX DRAWINGS LIGHT LEFTU+256FBOX DRAWINGS LIGHT ARC UP AND LEFTU+2575BOX DRAWINGS LIGHT UPU+256EBOX DRAWINGS LIGHT ARC DOWN AND LEFTU+2576BOX DRAWINGS LIGHT RIGHTU+256DBOX DRAWINGS LIGHT ARC DOWN AND RIGHTU+2577BOX DRAWINGS LIGHT DOWNU+256CBOX DRAWINGS DOUBLE VERTICAL AND HORIZONTALU+2578BOX DRAWINGS HEAVY LEFT128 characters in the Box Drawing Unicode block.
U+2500BOX DRAWINGS LIGHT HORIZONTALU+2501BOX DRAWINGS HEAVY HORIZONTALU+2502BOX DRAWINGS LIGHT VERTICALU+2503BOX DRAWINGS HEAVY VERTICALU+2504BOX DRAWINGS LIGHT TRIPLE DASH HORIZONTALU+2505BOX DRAWINGS HEAVY TRIPLE DASH HORIZONTALU+2506BOX DRAWINGS LIGHT TRIPLE DASH VERTICALU+2507BOX DRAWINGS HEAVY TRIPLE DASH VERTICALU+2508BOX DRAWINGS LIGHT QUADRUPLE DASH HORIZONTALU+2509BOX DRAWINGS HEAVY QUADRUPLE DASH HORIZONTALU+250ABOX DRAWINGS LIGHT QUADRUPLE DASH VERTICALU+250BBOX DRAWINGS HEAVY QUADRUPLE DASH VERTICALU+250CBOX DRAWINGS LIGHT DOWN AND RIGHTU+250DBOX DRAWINGS DOWN LIGHT AND RIGHT HEAVYU+250EBOX DRAWINGS DOWN HEAVY AND RIGHT LIGHTU+250FBOX DRAWINGS HEAVY DOWN AND RIGHTU+2510BOX DRAWINGS LIGHT DOWN AND LEFTU+2511BOX DRAWINGS DOWN LIGHT AND LEFT HEAVYU+2512BOX DRAWINGS DOWN HEAVY AND LEFT LIGHTU+2513BOX DRAWINGS HEAVY DOWN AND LEFTU+2514BOX DRAWINGS LIGHT UP AND RIGHTU+2515BOX DRAWINGS UP LIGHT AND RIGHT HEAVYU+2516BOX DRAWINGS UP HEAVY AND RIGHT LIGHTU+2517BOX DRAWINGS HEAVY UP AND RIGHTU+2518BOX DRAWINGS LIGHT UP AND LEFTU+2519BOX DRAWINGS UP LIGHT AND LEFT HEAVYU+251ABOX DRAWINGS UP HEAVY AND LEFT LIGHTU+251BBOX DRAWINGS HEAVY UP AND LEFTU+251CBOX DRAWINGS LIGHT VERTICAL AND RIGHTU+251DBOX DRAWINGS VERTICAL LIGHT AND RIGHT HEAVYU+251EBOX DRAWINGS UP HEAVY AND RIGHT DOWN LIGHTU+251FBOX DRAWINGS DOWN HEAVY AND RIGHT UP LIGHTU+2520BOX DRAWINGS VERTICAL HEAVY AND RIGHT LIGHTU+2521BOX DRAWINGS DOWN LIGHT AND RIGHT UP HEAVYU+2522BOX DRAWINGS UP LIGHT AND RIGHT DOWN HEAVYU+2523BOX DRAWINGS HEAVY VERTICAL AND RIGHTU+2524BOX DRAWINGS LIGHT VERTICAL AND LEFTU+2525BOX DRAWINGS VERTICAL LIGHT AND LEFT HEAVYU+2526BOX DRAWINGS UP HEAVY AND LEFT DOWN LIGHTU+2527BOX DRAWINGS DOWN HEAVY AND LEFT UP LIGHTU+2528BOX DRAWINGS VERTICAL HEAVY AND LEFT LIGHTU+2529BOX DRAWINGS DOWN LIGHT AND LEFT UP HEAVYU+252ABOX DRAWINGS UP LIGHT AND LEFT DOWN HEAVYU+252BBOX DRAWINGS HEAVY VERTICAL AND LEFTU+252CBOX DRAWINGS LIGHT DOWN AND HORIZONTALU+252DBOX DRAWINGS LEFT HEAVY AND RIGHT DOWN LIGHTU+252EBOX DRAWINGS RIGHT HEAVY AND LEFT DOWN LIGHTU+252FBOX DRAWINGS DOWN LIGHT AND HORIZONTAL HEAVYU+2530BOX DRAWINGS DOWN HEAVY AND HORIZONTAL LIGHTU+2531BOX DRAWINGS RIGHT LIGHT AND LEFT DOWN HEAVYU+2532BOX DRAWINGS LEFT LIGHT AND RIGHT DOWN HEAVYU+2533BOX DRAWINGS HEAVY DOWN AND HORIZONTALU+2534BOX DRAWINGS LIGHT UP AND HORIZONTALU+2535BOX DRAWINGS LEFT HEAVY AND RIGHT UP LIGHTU+2536BOX DRAWINGS RIGHT HEAVY AND LEFT UP LIGHTU+2537BOX DRAWINGS UP LIGHT AND HORIZONTAL HEAVYU+2538BOX DRAWINGS UP HEAVY AND HORIZONTAL LIGHTU+2539BOX DRAWINGS RIGHT LIGHT AND LEFT UP HEAVYU+253ABOX DRAWINGS LEFT LIGHT AND RIGHT UP HEAVYU+253BBOX DRAWINGS HEAVY UP AND HORIZONTALU+253CBOX DRAWINGS LIGHT VERTICAL AND HORIZONTALU+253DBOX DRAWINGS LEFT HEAVY AND RIGHT VERTICAL LIGHTU+253EBOX DRAWINGS RIGHT HEAVY AND LEFT VERTICAL LIGHTU+253FBOX DRAWINGS VERTICAL LIGHT AND HORIZONTAL HEAVYU+2540BOX DRAWINGS UP HEAVY AND DOWN HORIZONTAL LIGHTU+2541BOX DRAWINGS DOWN HEAVY AND UP HORIZONTAL LIGHTU+2542BOX DRAWINGS VERTICAL HEAVY AND HORIZONTAL LIGHTU+2543BOX DRAWINGS LEFT UP HEAVY AND RIGHT DOWN LIGHTU+2544BOX DRAWINGS RIGHT UP HEAVY AND LEFT DOWN LIGHTU+2545BOX DRAWINGS LEFT DOWN HEAVY AND RIGHT UP LIGHTU+2546BOX DRAWINGS RIGHT DOWN HEAVY AND LEFT UP LIGHTU+2547BOX DRAWINGS DOWN LIGHT AND UP HORIZONTAL HEAVYU+2548BOX DRAWINGS UP LIGHT AND DOWN HORIZONTAL HEAVYU+2549BOX DRAWINGS RIGHT LIGHT AND LEFT VERTICAL HEAVYU+254ABOX DRAWINGS LEFT LIGHT AND RIGHT VERTICAL HEAVYU+254BBOX DRAWINGS HEAVY VERTICAL AND HORIZONTALU+254CBOX DRAWINGS LIGHT DOUBLE DASH HORIZONTALU+254DBOX DRAWINGS HEAVY DOUBLE DASH HORIZONTALU+254EBOX DRAWINGS LIGHT DOUBLE DASH VERTICALU+254FBOX DRAWINGS HEAVY DOUBLE DASH VERTICALU+2550BOX DRAWINGS DOUBLE HORIZONTALU+2551BOX DRAWINGS DOUBLE VERTICALU+2552BOX DRAWINGS DOWN SINGLE AND RIGHT DOUBLEU+2553BOX DRAWINGS DOWN DOUBLE AND RIGHT SINGLEU+2554BOX DRAWINGS DOUBLE DOWN AND RIGHTU+2555BOX DRAWINGS DOWN SINGLE AND LEFT DOUBLEU+2556BOX DRAWINGS DOWN DOUBLE AND LEFT SINGLEU+2557BOX DRAWINGS DOUBLE DOWN AND LEFTU+2558BOX DRAWINGS UP SINGLE AND RIGHT DOUBLEU+2559BOX DRAWINGS UP DOUBLE AND RIGHT SINGLEU+255ABOX DRAWINGS DOUBLE UP AND RIGHTU+255BBOX DRAWINGS UP SINGLE AND LEFT DOUBLEU+255CBOX DRAWINGS UP DOUBLE AND LEFT SINGLEU+255DBOX DRAWINGS DOUBLE UP AND LEFTU+255EBOX DRAWINGS VERTICAL SINGLE AND RIGHT DOUBLEU+255FBOX DRAWINGS VERTICAL DOUBLE AND RIGHT SINGLEU+2560BOX DRAWINGS DOUBLE VERTICAL AND RIGHTU+2561BOX DRAWINGS VERTICAL SINGLE AND LEFT DOUBLEU+2562BOX DRAWINGS VERTICAL DOUBLE AND LEFT SINGLEU+2563BOX DRAWINGS DOUBLE VERTICAL AND LEFTU+2564BOX DRAWINGS DOWN SINGLE AND HORIZONTAL DOUBLEU+2565BOX DRAWINGS DOWN DOUBLE AND HORIZONTAL SINGLEU+2566BOX DRAWINGS DOUBLE DOWN AND HORIZONTALU+2567BOX DRAWINGS UP SINGLE AND HORIZONTAL DOUBLEU+2568BOX DRAWINGS UP DOUBLE AND HORIZONTAL SINGLEU+2569BOX DRAWINGS DOUBLE UP AND HORIZONTALU+256ABOX DRAWINGS VERTICAL SINGLE AND HORIZONTAL DOUBLEU+256BBOX DRAWINGS VERTICAL DOUBLE AND HORIZONTAL SINGLEU+256CBOX DRAWINGS DOUBLE VERTICAL AND HORIZONTALU+256DBOX DRAWINGS LIGHT ARC DOWN AND RIGHTU+256EBOX DRAWINGS LIGHT ARC DOWN AND LEFTU+256FBOX DRAWINGS LIGHT ARC UP AND LEFTU+2570BOX DRAWINGS LIGHT ARC UP AND RIGHTU+2571BOX DRAWINGS LIGHT DIAGONAL UPPER RIGHT TO LOWER LEFTU+2572BOX DRAWINGS LIGHT DIAGONAL UPPER LEFT TO LOWER RIGHTU+2573BOX DRAWINGS LIGHT DIAGONAL CROSSU+2574BOX DRAWINGS LIGHT LEFTU+2575BOX DRAWINGS LIGHT UPU+2576BOX DRAWINGS LIGHT RIGHTU+2577BOX DRAWINGS LIGHT DOWNU+2578BOX DRAWINGS HEAVY LEFTU+2579BOX DRAWINGS HEAVY UPU+257ABOX DRAWINGS HEAVY RIGHTU+257BBOX DRAWINGS HEAVY DOWNU+257CBOX DRAWINGS LIGHT LEFT AND HEAVY RIGHTU+257DBOX DRAWINGS LIGHT UP AND HEAVY DOWNU+257EBOX DRAWINGS HEAVY LEFT AND LIGHT RIGHTU+257FBOX DRAWINGS HEAVY UP AND LIGHT DOWN