how is the design called?

The design introduced by Apple at WWDC is called "Liquid Glass." It is a new material that is central to the design updates in iOS 26 and other platforms. Liquid Glass is described as translucent, dynamic, and alive, with optical qualities similar to glass and a fluidity that Apple has uniquely achieved. It transforms depending on the content or context, bringing more clarity and a sense of depth and vitality to the user interface. This design is part of a broader effort to create a unified design language across Apple's platforms, enhancing the user experience by making it more personal and focused on content.