This is the keystone to all recursively converted templates (e.g. template:game of life, template:square root, template:philidor position). It is a copy of meta:template:subst and it has nothing to do with w:template:subst. If you have any questions, please ask me.
- Substituting this template produces one or more new substitution template calls, allowing recursive change of a page, see m:Help:Recursive conversion of wikitext.