It's a logo of Rs 232 Male. It's pretty much reduced to a trapezoid with several dots inside of it. The top row of dots has five and the bottom has four.
This RS-232 Male icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.