Idea of Micro Icon
This icon is meant to represent a microphone. It uses a circle with a line through it to represent the business end of the microphone and a tapering rectangle of uneven sides to represent the handle. There is a small line running parallel to the sides of the handle that represents the power switch and curved line coming out of the bottom of the handle that represents the power cord.
This page shows the different variations of the Micro from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.