A ribbon with a notched foot, saving a page for later.
A rectangle with a V cut into its lower edge stands for saving something to return to. The shape is a physical bookmark ribbon, which is why it reads immediately even to people who never used one.
Saves the current item to a list the user can return to, distinct from marking it as liked or approved.
Contexts: Software
The shape depicts the ribbon sewn into a physical book, carried into software as a metaphor for the same act.
Contexts: Software
A tall rectangle whose lower edge is cut upward into a V, leaving two points at its bottom corners.
Both save something for later; the star usually means a rating or a favourite, the ribbon a reading list, but the two are used interchangeably in practice.