This Pin in circle 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.
This is a basic icon of a push pin, the kind with the plastic part you push on and is easier pulled out. The plastic part looks like an hourglass shape with how it narrows in the middle. The whole push pin is tilted 45 degrees. Around the push pin is a circle.