Mixin : In object-oriented programming languages, a mixin is a class that contains methods for use by other classes without having to be the parent class of those other classes; No inheritance needed. - https://en.wikipedia.org/wiki/Mixin​
<cfinclude>
tag and the include
construct for including files in script - https://cfdocs.org/cfinclude.template
argument is a relative, absolute or CFML mapping path to the template to inject.