Why would you ever want to add a backslash into tags with jQuery?

Why would you ever want to add a backslash into tags with jQuery?

Hi,

I am new to jQuery and have been using some pre-written code to learn with.

One piece of this code is using the .after() function to add in some tags, I understand that concept, I just don't understand why they would be adding some thing like this:
  1. <\/ul>
 What is the purpose of that backslash in there? This is the whole line: 
  1. jQuery(this).after("<div class='stripTransmitter' id='stripTransmitter" + (j) + "'><ul><\/ul><\/div>");
Thanks for any help!

-Brian