what do permissions mean on ls -l

I typed  "ls -l" and I don't understand the last character.  It says:
d---rwx---+       share
What does "+" mean?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
+ (plus) suffix indicates an Access Control List which can grant additional permissions. See details with man getfacl.
In addition to what has already been mentioned, it basically means that the Linux kernel supports extended attributes, apart from the traditional security mechanism.  It depends on the Kernel, filesystem type and/or configuration as to what those may be.  

Yes, ACLs are part of it.  It could also be SELinux.  To see SELinux attribute details you can also issue command
ls -Z

REF: http://en.wikipedia.org/wiki/Extended_file_attributes

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