“collapse”

16 symbols from Material Design Icons

collapse-all

collapse-all-outline

arrow-collapse

arrow-collapse-all

arrow-collapse-down

arrow-collapse-horizontal

arrow-collapse-left

arrow-collapse-right

arrow-collapse-up

arrow-collapse-vertical

calendar-collapse-horizontal

calendar-collapse-horizontal-outline

unfold-less-horizontal

unfold-less-vertical

format-horizontal-align-center

format-vertical-align-center