Mavericks Вђ” 10.9.3 (app Store) [intel] | Fast

Specifies that this version is for Intel-based Mac computers, as Mavericks was released well after Apple's transition away from PowerPC processors.

This is OS X 10.9, released by Apple in 2013 [1]. Mavericks — 10.9.3 (App Store) [Intel]

The string refers to a specific version of the Apple macOS Mavericks operating system (version 10.9.3) . Specifies that this version is for Intel-based Mac