The asterisk * is a "wildcard" option. It means that it can be filled by any number in its place.
writing 5* - means that it covers everything with 55 in front:
Okay, so why might I need this?
The asterisk is useful if you need to place a block on a set of pages, but it may have various endings. The opposite might also be true - maybe you want to have a block display on all pages, except a set of pages with a similar beginning.
On the edit page of the block, scroll to the visibility settings near the bottom of the page.
Choose your option:
- all pages except those listed
- only the listed pages
(ignore the last option)
The most common instance to use this option is for the checkout pages in your store.
If you have a block you only want to have appear on checkout pages, type the following into the box:
This will cover all checkout pages.