What is this menu called in UX/UI parlance?
I want to implement this type of menu in my UI (ASP.NET MVC 5). My default styling is done with Bootstrap 3+.
What's it called?
I'm not sure if a canonical name exists. But here are some terms that help describe it...
How do I implement it?
If you wanted to build your own, I would use the Bootstrap Popover component and populate it with a grid of divs containing large icons paired with labels.
You could use the following recreation of the App Launcher as a starting point: Google App Launcher Code Pen by Manar Kamel