This is the silhouette of the head and shoulders of a male. he lacks facial features. He has a hard hat. The hard hat looks like a semi-circle, with two nubs on the left and right of the semi-circle. There is a long rectangle sticking out of the semi-circle on the front.
This is a Worker icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.