sign to prompt you to create those pages.
Suppose you want to link to a page in the current space called 'Home', you just put the following in the page:
[Home] |
Confluence will interpret this as being an inter-page link, like this: Home.
Confluence also allows you to create a link first and enter content for the new page later. These are undefined links and are indicated with this sign to prompt you to create those pages.