The icon is a picture of the connector Toslink. The icon is a cylindrical shape with a rectangle extending out of it. There is a flat head needle coming out of the rectangle. The other end has a wire attached to it.
This Toslink 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.