\ <===> Escape character. If you want to reference a special character, you must “escape” it with a backslash first. Example: touch /tmp/filename\*
/ <===> Directory separator, used to separate a string of directory names. Example: /usr/src/linux
. <===> Current directory. Can also “hide” files when it is the first character in a filename.
.. <===> Parent directory
~ <===> User's home directory