What does "+","." mean which follow the permission from the output of ll command?

Solution Verified - Updated -

Issue

What does "+","." mean which follow the permission from the output of ll command?

dr-xr-xr-x.   2 root root    4096 11月 12 03:43 2013 bin
drwxr-xr-t+   1 root root      52 11月 26 18:35 2013 nfstest
drwxr-xr-x   16 root root    4120  2月 14 09:59 2014 dev

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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