theatertheatre
Theatertheatre is a term that appears infrequently in scholarly or arts writing and does not denote a single widely recognized entity. More often, it is encountered as a stylized compound or branding element that combines the noun theatre with itself, either to emphasize the domain of performing arts or to signal a meta or self-referential approach to theatre.
Possible meanings include several overlapping senses. As a proper name, it may designate a theatre company
Note that the term is not standardized. Writers may instead use related concepts such as metatheatre, self-reflexive