Announced by several key Twitter employees, including product VP Keith Coleman, the new feature could be called "save for later."
As she pointed out, there are roundabout ways to bookmark a tweet — for example, you can DM it to yourself, like it or retweet it. But a dedicated "save for later" button is probably a better option than cluttering your direct messages and likes.
Shah also shared an "early prototype" of the feature in a short video (below), but said the final version of the feature is "likely to change." In her example, the feature is simply called "Bookmarks."