“empty”

26 symbols from Material Design Icons

bed-empty

delete-empty

flask-empty

gauge-empty

delete-empty-outline

flask-empty-minus

flask-empty-off

flask-empty-outline

flask-empty-plus

flask-empty-remove

test-tube-empty

timer-sand-empty

flask-empty-minus-outline

flask-empty-off-outline

flask-empty-plus-outline

flask-empty-remove-outline

flask-round-bottom-empty

flask-round-bottom-empty-outline

battery-outline

cup-outline

kettle-outline

battery-clock-outline

kettle-alert-outline

kettle-off-outline

kettle-steam-outline

battery-charging-wireless-outline