What is the nicknames for Mac OS X?

Mac OS X has several nicknames, often based on big cat names and California landmarks. The early versions were named after big cats, such as "Cheetah," "Puma," and "Jaguar." Starting with version 10.9, the naming convention shifted to California landmarks, with names like "Mavericks," "Yosemite," and "Sierra." Overall, these nicknames reflect both the operating system's evolution and its connection to nature and geography.