If the final character is an at sign ( then it signifies that the file or folder has extended file attributes relating to security, giving certain apps (like Finder) persistent file access.
rwx means the file can be read, written, and executed. 
r-x means the file can be read and executed, but not written to. rw- would mean the file can be read and written to, but the file isn’t executable. r- would mean the file can be read, but not written to, and the file isn’t executable. - would mean no read or write access, and the file isn’t executable. These levels are always shown in that order, so for instance: You’ll see letters here, too, such as r (read), w (write), and x (execute).
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