209.150.67.45,
Contributions/209.150.67.45 (some of these are mine} 68.7.124.252,
Contributions/68.7.124.252 208.4.145.66,
Contributions/208.4.145.66 (some of these are mine}
Many article titles are disambiguated with parenthetic qualifiers, like this: [[Self (psychology)]]. But when you want to include such a link in the body of an article, this would look rather awkward. So all you have to do is use the "pipe trick", like this: [[Self (psychology)|]]. Notice the "|" character stuck in there at the end of the link? That makes the link look like this: Self, without having to type the name of the link after the pipe!
This trick also works with namespaces, so that [[Wikipedia:Tip of the day|]] (again notice the pipe character) displays like this: Tip of the day.