Codule
From WikiManual
A Codule is a structure of the Robot DNA that contains one (but usually more) Base Pair(s). These are similar to the Genes in DB2, but only the first one is activated, and they can be called upon to activate from within other codules. While recursion is still going to be very limited in terms of memory that can be used, this does allow for recursive methods in DB3. Like Custom Variables, a codule can also be given a name using a Meta Tag, by which you can reference it.