This Zaproszenie 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 4,300 icons, all in the same style and quality.
An invite icon consists of an envelope and a piece of paper that is coming out of the envelope. The envelope will be open so the flaps on the top will be lifted up to show the rectangular shape paper. The paper will also have information such as a plus sign on it.