This icon is a part of a collection of Kalendarz 30 flat icons produced by Icons8. Icons follow the guidelines of iOS, Windows, and Android and are designed by a single designer, guaranteeing the consistent quality.
This is a calendar page that is displaying the number thirty. There is no month displayed, nor is there a day. There are, however, what looks like two rings protruding from the top of the page, suggesting that this is a calendar that can be adapted for reuse month after month.