This is a picture of a jet engine and you can see the fan going around. it has a circular center with spokes all around it. the rim of the engine can also be seen.
This Jet Engine 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 5,500 icons, all in the same style and quality.