Plus and Minus. You'll notice that your Instant Pot has a Plus and Minus button in the very center. These are probably the most used keys, as you'll see below.

Spotify's algorithm benefits from user input, with the Minus button hiding disliked songs. Historically, the UI design has been inconsistent with the placement of Plus and Minus buttons. New ...

Spotify’s replacing its heart icon with a “plus” button that lets you save songs to your library and add them to a specific playlist. It’s rolling out globally on iOS and Android.