Currently the breadcrumb separators are formed of greater-than characters to give visitors to your site an idea of which page they have navigated through to. Like all RapidWeaver themes, the breadcrumb separators are assigned in the theme.plist file. You can change the breadcrumb separators displayed by editing the theme.plist file.
The theme.plist file is found inside the theme contents. This is a very complicated file to edit, so it is strongly recommended you open the theme.plist file in a suitable GUI editor. Apple supply a free preference list editor with Xcode developer tools. Alternatively you may want to try a third-party one like PlistEdit Pro.
Open the theme.plist file in your preferred editor and scroll down to the point called RWToolbar pictured below.
Here (highlighted) you can change the display of your breadcrumb including the separator characters. It is recommended you always use HTML entities instead of typing special character in. Information and lists of HTML entities can be found on the internet. Save and close the theme.plist file when you have finished editing it.