This icon is a part of a collection of Kieliszek 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. Both PNG and vector are available.
The icon is a wine glass. The glass is a classic tulip glass that you would put wine into, underneath the tulip part that would hold some wine or other liquid in it is a narrow stem. Within the glass is some liquid.