{{{{{{1}}}}}}
This is a parameter selection template. It returns the value of the parameter whose name is the value of parameter 1.
Usage
edit{{pst1|1|9|7}}→ 1{{pst1|2|9|7}}→ 9{{pst1|3|9|7}}→ 7{{pst1|a|a=7|b=9}}→ 7{{pst1|b|a=7|b=9}}→ 9{{pst1|{{{1}}}=9}}→ 9 - if parameter 1 is undefined the template returns the value of the parameter with the name "{{{1}}}".
m:Template:Pp is identical.