Idea of Resize Vertical Icon
There is a single vertical arrow that has two arrow heads, each arrow head is pointing in an opposite direction with one of them going up and one of them going down.
This is a Resize Vertical icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,900 icons, all in the same style and quality.