Pair of vertical harpoons side by side, one pointing up and one down, like an up-down equilibrium arrow used in math and chemistry.
U+296DRIGHTWARDS HARPOON WITH BARB DOWN BELOW LONG DASHU+296FDOWNWARDS HARPOON WITH BARB LEFT BESIDE UPWARDS HARPOON WITH BARB RIGHTU+296CRIGHTWARDS HARPOON WITH BARB UP ABOVE LONG DASHU+2970RIGHT DOUBLE ARROW WITH ROUNDED HEADU+296BLEFTWARDS HARPOON WITH BARB DOWN BELOW LONG DASHU+2971EQUALS SIGN ABOVE RIGHTWARDS ARROWU+296ALEFTWARDS HARPOON WITH BARB UP ABOVE LONG DASHU+2972TILDE OPERATOR ABOVE RIGHTWARDS ARROWU+2969RIGHTWARDS HARPOON WITH BARB DOWN ABOVE LEFTWARDS HARPOON WITH BARB DOWNU+2973LEFTWARDS ARROW ABOVE TILDE OPERATORU+2968RIGHTWARDS HARPOON WITH BARB UP ABOVE LEFTWARDS HARPOON WITH BARB UPU+2974RIGHTWARDS ARROW ABOVE TILDE OPERATOR128 characters in the Supplemental Arrows-B Unicode block.
U+2900RIGHTWARDS TWO-HEADED ARROW WITH VERTICAL STROKEU+2901RIGHTWARDS TWO-HEADED ARROW WITH DOUBLE VERTICAL STROKEU+2902LEFTWARDS DOUBLE ARROW WITH VERTICAL STROKEU+2903RIGHTWARDS DOUBLE ARROW WITH VERTICAL STROKEU+2904LEFT RIGHT DOUBLE ARROW WITH VERTICAL STROKEU+2905RIGHTWARDS TWO-HEADED ARROW FROM BARU+2906LEFTWARDS DOUBLE ARROW FROM BARU+2907RIGHTWARDS DOUBLE ARROW FROM BARU+2908DOWNWARDS ARROW WITH HORIZONTAL STROKEU+2909UPWARDS ARROW WITH HORIZONTAL STROKEU+290AUPWARDS TRIPLE ARROWU+290BDOWNWARDS TRIPLE ARROWU+290CLEFTWARDS DOUBLE DASH ARROWU+290DRIGHTWARDS DOUBLE DASH ARROWU+290ELEFTWARDS TRIPLE DASH ARROWU+290FRIGHTWARDS TRIPLE DASH ARROWU+2910RIGHTWARDS TWO-HEADED TRIPLE DASH ARROWU+2911RIGHTWARDS ARROW WITH DOTTED STEMU+2912UPWARDS ARROW TO BARU+2913DOWNWARDS ARROW TO BARU+2914RIGHTWARDS ARROW WITH TAIL WITH VERTICAL STROKEU+2915RIGHTWARDS ARROW WITH TAIL WITH DOUBLE VERTICAL STROKEU+2916RIGHTWARDS TWO-HEADED ARROW WITH TAILU+2917RIGHTWARDS TWO-HEADED ARROW WITH TAIL WITH VERTICAL STROKEU+2918RIGHTWARDS TWO-HEADED ARROW WITH TAIL WITH DOUBLE VERTICAL STROKEU+2919LEFTWARDS ARROW-TAILU+291ARIGHTWARDS ARROW-TAILU+291BLEFTWARDS DOUBLE ARROW-TAILU+291CRIGHTWARDS DOUBLE ARROW-TAILU+291DLEFTWARDS ARROW TO BLACK DIAMONDU+291ERIGHTWARDS ARROW TO BLACK DIAMONDU+291FLEFTWARDS ARROW FROM BAR TO BLACK DIAMONDU+2920RIGHTWARDS ARROW FROM BAR TO BLACK DIAMONDU+2921NORTH WEST AND SOUTH EAST ARROWU+2922NORTH EAST AND SOUTH WEST ARROWU+2923NORTH WEST ARROW WITH HOOKU+2924NORTH EAST ARROW WITH HOOKU+2925SOUTH EAST ARROW WITH HOOKU+2926SOUTH WEST ARROW WITH HOOKU+2927NORTH WEST ARROW AND NORTH EAST ARROWU+2928NORTH EAST ARROW AND SOUTH EAST ARROWU+2929SOUTH EAST ARROW AND SOUTH WEST ARROWU+292ASOUTH WEST ARROW AND NORTH WEST ARROWU+292BRISING DIAGONAL CROSSING FALLING DIAGONALU+292CFALLING DIAGONAL CROSSING RISING DIAGONALU+292DSOUTH EAST ARROW CROSSING NORTH EAST ARROWU+292ENORTH EAST ARROW CROSSING SOUTH EAST ARROWU+292FFALLING DIAGONAL CROSSING NORTH EAST ARROWU+2930RISING DIAGONAL CROSSING SOUTH EAST ARROWU+2931NORTH EAST ARROW CROSSING NORTH WEST ARROWU+2932NORTH WEST ARROW CROSSING NORTH EAST ARROWU+2933WAVE ARROW POINTING DIRECTLY RIGHTU+2934ARROW POINTING RIGHTWARDS THEN CURVING UPWARDSU+2935ARROW POINTING RIGHTWARDS THEN CURVING DOWNWARDSU+2936ARROW POINTING DOWNWARDS THEN CURVING LEFTWARDSU+2937ARROW POINTING DOWNWARDS THEN CURVING RIGHTWARDSU+2938RIGHT-SIDE ARC CLOCKWISE ARROWU+2939LEFT-SIDE ARC ANTICLOCKWISE ARROWU+293ATOP ARC ANTICLOCKWISE ARROWU+293BBOTTOM ARC ANTICLOCKWISE ARROWU+293CTOP ARC CLOCKWISE ARROW WITH MINUSU+293DTOP ARC ANTICLOCKWISE ARROW WITH PLUSU+293ELOWER RIGHT SEMICIRCULAR CLOCKWISE ARROWU+293FLOWER LEFT SEMICIRCULAR ANTICLOCKWISE ARROWU+2940ANTICLOCKWISE CLOSED CIRCLE ARROWU+2941CLOCKWISE CLOSED CIRCLE ARROWU+2942RIGHTWARDS ARROW ABOVE SHORT LEFTWARDS ARROWU+2943LEFTWARDS ARROW ABOVE SHORT RIGHTWARDS ARROWU+2944SHORT RIGHTWARDS ARROW ABOVE LEFTWARDS ARROWU+2945RIGHTWARDS ARROW WITH PLUS BELOWU+2946LEFTWARDS ARROW WITH PLUS BELOWU+2947RIGHTWARDS ARROW THROUGH XU+2948LEFT RIGHT ARROW THROUGH SMALL CIRCLEU+2949UPWARDS TWO-HEADED ARROW FROM SMALL CIRCLEU+294ALEFT BARB UP RIGHT BARB DOWN HARPOONU+294BLEFT BARB DOWN RIGHT BARB UP HARPOONU+294CUP BARB RIGHT DOWN BARB LEFT HARPOONU+294DUP BARB LEFT DOWN BARB RIGHT HARPOONU+294ELEFT BARB UP RIGHT BARB UP HARPOONU+294FUP BARB RIGHT DOWN BARB RIGHT HARPOONU+2950LEFT BARB DOWN RIGHT BARB DOWN HARPOONU+2951UP BARB LEFT DOWN BARB LEFT HARPOONU+2952LEFTWARDS HARPOON WITH BARB UP TO BARU+2953RIGHTWARDS HARPOON WITH BARB UP TO BARU+2954UPWARDS HARPOON WITH BARB RIGHT TO BARU+2955DOWNWARDS HARPOON WITH BARB RIGHT TO BARU+2956LEFTWARDS HARPOON WITH BARB DOWN TO BARU+2957RIGHTWARDS HARPOON WITH BARB DOWN TO BARU+2958UPWARDS HARPOON WITH BARB LEFT TO BARU+2959DOWNWARDS HARPOON WITH BARB LEFT TO BARU+295ALEFTWARDS HARPOON WITH BARB UP FROM BARU+295BRIGHTWARDS HARPOON WITH BARB UP FROM BARU+295CUPWARDS HARPOON WITH BARB RIGHT FROM BARU+295DDOWNWARDS HARPOON WITH BARB RIGHT FROM BARU+295ELEFTWARDS HARPOON WITH BARB DOWN FROM BARU+295FRIGHTWARDS HARPOON WITH BARB DOWN FROM BARU+2960UPWARDS HARPOON WITH BARB LEFT FROM BARU+2961DOWNWARDS HARPOON WITH BARB LEFT FROM BARU+2962LEFTWARDS HARPOON WITH BARB UP ABOVE LEFTWARDS HARPOON WITH BARB DOWNU+2963UPWARDS HARPOON WITH BARB LEFT BESIDE UPWARDS HARPOON WITH BARB RIGHTU+2964RIGHTWARDS HARPOON WITH BARB UP ABOVE RIGHTWARDS HARPOON WITH BARB DOWNU+2965DOWNWARDS HARPOON WITH BARB LEFT BESIDE DOWNWARDS HARPOON WITH BARB RIGHTU+2966LEFTWARDS HARPOON WITH BARB UP ABOVE RIGHTWARDS HARPOON WITH BARB UPU+2967LEFTWARDS HARPOON WITH BARB DOWN ABOVE RIGHTWARDS HARPOON WITH BARB DOWNU+2968RIGHTWARDS HARPOON WITH BARB UP ABOVE LEFTWARDS HARPOON WITH BARB UPU+2969RIGHTWARDS HARPOON WITH BARB DOWN ABOVE LEFTWARDS HARPOON WITH BARB DOWNU+296ALEFTWARDS HARPOON WITH BARB UP ABOVE LONG DASHU+296BLEFTWARDS HARPOON WITH BARB DOWN BELOW LONG DASHU+296CRIGHTWARDS HARPOON WITH BARB UP ABOVE LONG DASHU+296DRIGHTWARDS HARPOON WITH BARB DOWN BELOW LONG DASHU+296EUPWARDS HARPOON WITH BARB LEFT BESIDE DOWNWARDS HARPOON WITH BARB RIGHTU+296FDOWNWARDS HARPOON WITH BARB LEFT BESIDE UPWARDS HARPOON WITH BARB RIGHTU+2970RIGHT DOUBLE ARROW WITH ROUNDED HEADU+2971EQUALS SIGN ABOVE RIGHTWARDS ARROWU+2972TILDE OPERATOR ABOVE RIGHTWARDS ARROWU+2973LEFTWARDS ARROW ABOVE TILDE OPERATORU+2974RIGHTWARDS ARROW ABOVE TILDE OPERATORU+2975RIGHTWARDS ARROW ABOVE ALMOST EQUAL TOU+2976LESS-THAN ABOVE LEFTWARDS ARROWU+2977LEFTWARDS ARROW THROUGH LESS-THANU+2978GREATER-THAN ABOVE RIGHTWARDS ARROWU+2979SUBSET ABOVE RIGHTWARDS ARROWU+297ALEFTWARDS ARROW THROUGH SUBSETU+297BSUPERSET ABOVE LEFTWARDS ARROWU+297CLEFT FISH TAILU+297DRIGHT FISH TAILU+297EUP FISH TAILU+297FDOWN FISH TAIL