I know what dot files or folders are, but there is a specific dot named folder (the name is just a dot) in every directories. What are they used for?
For example here is a part of my "bin" folder. Look at the first tow lines.
drwxr-xr-x 2 root root 4.0K Jul 29 12:39 .
drwxr-xr-x 23 root root 4.0K Jul 29 12:37 ..
-rwxr-xr-x 1 root root 904K Mar 30 20:02 bash
-rwxr-xr-x 1 root root 30K Aug 3 2012 bunzip2
...