In addition to the commands, there are several symbols that are used. These modify or combine the actions of commands. The table below gives a list.
The most commonly used symbols are the two redirection symbols ">" and ">>" and the so-called pipe, "¦" . (Just to make sure there is no confusion, the "pipe" is the symbol above the back slash on most keyboards. On keyboards it has a break in the middle but the break does not always show when you type the symbol. A special code is used to show it on a Web page.)
Reference: http://commandwindows.com/command1.htm