The group has Read and Execute permissions (but cannot write/modify).

There is also a niche possibility you are looking at a specific repository or script named "Gecko" (perhaps a tool for web scraping or automation) where the user is being instructed to set the directory permissions to 755 (which translates to drwxr-xr-x ) to allow the program to run.

: The group can read and execute, but not modify contents.

The system administrator, Sarah, sat three floors up, staring at her monitor in confusion. A terminal window had popped open. Someone—or something—was navigating the root directory. "What the...?" she whispered, watching the cursor blink.