Naming rules at /etc/rc.d

[Cecep]

Somebody help me,

I use RedHat 5.1 for my machine and I've just made a script file that
will execute some command at start-up. I place it in /etc/rc.d/init.d/ and
then make a sym link that is stored in /etc/rc.d/rc3.d/. I saw that
symbolic links in /etc/rc.d/rc3.d/ have sort of naming pattern,for
example:

K15gpm          K60lpd          S10network      S32gated
K20rwhod        S50inet         S91smb          S85httpd

Is there any naming rule that is used to create symbolic link in this
directory ?

Thanx,

Cecep