This icon is a part of a collection of Sand Clock 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.
Imagine the top shape of a wine glass without the stand and base, and now imagine another one that is upside down and they're both connected. Both of the openings of the whine glasses are enclosed from the top and bottom. There is space in the middle for small objects to pass through.