A Google Webmaster Help thread has one webmaster asking if it is a bad idea to use pipes in the URL. A pipe is this: |. They asked if it is a bad idea to use it in your URL, such as www.seroundtable.com/my|awesome|page.html.

He said when he plugged in a URL with a pipe in it using the Google Keyword Tool, Google return an “invalid website” error response.

Google’s JohnMu said he doesn’t recommend you use the pipe. He said:

Just so you know, an inurl:| search does not return any results:

Forum discussion at <a href="Google Webmaster Help.