Idea of iOS Application Placeholder Icon
It is a little place to put the IOS apps that you download. It is a square box made out of dotted lines where you can put your newly downloaded apps so that they will not be sprawled out all overy our home screen, creating pages and taking up space.
This page shows the different variations of the iOS Application Placeholder from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.