What is the technical name for the "Tap to translate" button from GoogleTranslate app?

When copying some text on Android, Google Translate displays a floating button on the side of the screen (top / right) that can be tapped to translate or just dragged up and down to not be obstructive.

What is the technical name of it?

It looks like a coin, but I cannot find any specific name or pattern for the implementation (in web development with JS/CSS) of these buttons.