What key command is used to find the next occurrence of an item previously found?

The command used to find the next occurrence of an item previously found in macOS applications is the combination of the Command key and the G key. When you initiate a search (typically using Command - F), you can then use Command - G to go to the next instance of the search term. This is especially useful when a search yields multiple results, as it allows users to quickly navigate through them without having to restart the search process.

In contrast, other commands listed do not serve the same purpose: Command - F is for initiating the search, Command - N typically opens a new window or document, and Command - R is often used to refresh or reload content in applications or web pages. By using Command - G after setting up your search, you maintain an efficient workflow when scanning through multiple occurrences of the text.