<% Root.sitecounter %>
macro renders the number of site (either all or just the public ones)

Sourcecode in Root/macros.js:
1:   function sitecounter_macro(param) {
2:      if (param.count == "all")
3:         var size = root.size();
4:      else
5:         var size = this.publicSites.size();
6:      if (size == 0)
7:         res.write(param.no ? param.no : size);
8:      else if (size == 1)
9:         res.write(param.one ? param.one : size);
10:     else
11:        res.write(size + (param.more ? param.more : ""));
12:     return;
13:  }