The term trans system, also called a transitioned system or transgender system, can be used to describe a plural system that has gotten or wants to get a gender-related surgery for the body. The term exists to describe the collective decision of wanting to undergo surgery to make headmates more comfortable in front. It can also be used to describe when a system has decided on this purely because they have other headmates in the body now, and knows that they would not have made the same decision if they were a singlet. Another way in which the term can be used, is when all headmates within the system are a gender that is the opposite of the body's sex (eg. all-male headmates in an AFAB body), though using this term towards a system that hasn't consented to being comfortable with it could be harmful, as if stating that the headmates couldn't possibly feel euphoria in the body.
History
The term, as it is now, was coined on June 22nd, 2021, by FANDOM user: Rose.Quartz.Council