This is a Scart 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 12,900 icons, all in the same style and quality.
The Scart icon is a rectangle with rounded edges, but it has a small triangle that protrudes from the bottom right corner instead of a rounded edge. There are 15 small black vertical dashes in two rows inside the rectangle. There are 8 in the top row and 7 in the bottom row.