macOS 10.16

Apple announces macOS 10.16 is called Big Sur

Apple's promotional image for the macOS Big Sur software update for Mac computers

Apple has filed for dozens upon dozens of California-themed trademark applications for macOS names over the years, some of which like Yosemite, Sierra and Mojave were indeed used for major macOS releases. And today at the WWDC 2020 keynote, software engineering chief Craig Federighi announced that the official code-name for macOS 10.16 is "Big Sur".