It's a logo of HD 1080p reduced to an image with the numbers 1080 on it. The logo is enclosed by a square. It pretty much looks like the 1080p logo on most High definition televisions.
This is a HD 1080p 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.