Macos Sierra: 13th major version of the macOS operating system
macOS Sierra (version 10.12) is the thirteenth major release of macOS (previously Mac OS X from 2001 to 2012 and OS X from 2012 to 2016), Apple Inc.'s desktop and server operating system for Macintosh.
It was the first version of the operating system issued under the June 2016 renaming as macOS. Sierra is named after the Sierra Nevada mountain range in California and Nevada.
References
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