CommandShiftPeriod

CommandShiftPeriod is a keyboard shortcut commonly used in macOS to insert a period (.) followed by a space in various applications, such as text editors, web browsers, and email clients. This shortcut is particularly useful for quickly typing common abbreviations or acronyms, as it automatically expands the period into the full form of the abbreviation upon pressing the spacebar. For example, pressing Command+Shift+Period followed by a space after "dr." might auto-correct it to "Doctor" or "Dr." depending on the application's dictionary or context.

The shortcut is part of macOS’s built-in text expansion feature, which allows users to create custom shortcuts for frequently used phrases or corrections. While CommandShiftPeriod itself is not a predefined shortcut in macOS, it is often associated with the abbreviation "dr." due to its common use in email signatures or formal writing. Users can customize or disable this behavior in the system preferences under Keyboard > Text.

This shortcut is not exclusive to macOS and has been referenced in various online communities, particularly among users who rely on keyboard shortcuts for efficiency. Some third-party applications or extensions may also implement similar text expansion functions, allowing users to define their own shortcuts for specific phrases. The functionality relies on the system’s ability to recognize patterns and expand them based on predefined rules or dictionaries.