This looks like an upside down trapezoid. The corners of the trapezoid are rounded. In the center of the trapezoid are nine circles. There's a line of five circles near the top of the trapezoid, and a line of four circles near the bottom.
This icon is a part of a collection of RS-232 Female flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality.