It's a gear with black outlines on a white background. There are eight squared points on the gear with two circles on the inside that make a hole for other fittings.
This Engineering 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 6,000 icons, all in the same style and quality.