Extracted from the man page for ls at
http://www.scit.wlv.ac.uk/cgi-bin/mansec?1+ls
Quote:
The plus sign indicates that there is an ACL associated with the file.
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An access control list (ACL) allows you to specify who can see and use your folders. An ACL is a list of users you create along with the access permissions you're allowing for each. This enables you to protect the privacy of your folders, while at the same time allowing accessibility to others.