Y

rightwards paired arrows

U+21C9

downwards paired arrows

U+21CA

leftwards harpoon over rightwards harpoon

U+21CB

rightwards harpoon over leftwards harpoon

U+21CC

leftwards double arrow with stroke

U+21CD

leftwards double arrow

U+21D0

upwards double arrow

U+21D1

downwards double arrow

U+21D3

up down double arrow

U+21D5

north west double arrow

U+21D6

north east double arrow

U+21D7

south east double arrow

U+21D8

south west double arrow

U+21D9

leftwards triple arrow

U+21DA

rightwards triple arrow

U+21DB

rightwards squiggle arrow

U+21DD

leftwards arrow to bar

U+21E4

rightwards arrow to bar

U+21E5

left ceiling

U+2308

right ceiling

U+2309

left floor

U+230A

right floor

U+230B

top square bracket

U+23B4

bottom square bracket

U+23B5

radical symbol bottom

U+23B7

vertical line extension

U+23D0

white trapezium

U+23E2

black square

U+25A0

white square

U+25A1

black vertical rectangle

U+25AE