An "in-suite" bath is an exclusive bath entered from a bedroom that is NOT the master bedroom.
A bath that is accessed from two bedrooms that are not master bedrooms from two doors into the bath from two different bedrooms is often called a "Jack and Jill" setup...though they can be two Jacks or two Jills. :)
Builders are starting to call the 2nd floor "hall" bath a "main" bath, which is confusing because it is not on the main floor.
Another newer change in bathrooms is that the 1/2 bath on the main is starting to become a 3/4 bath on the main, whether there is a bedroom on that level or not. You have to ask yourself if the 1/2 "guest" or "powder" room for dinner guests should in fact include a regularly used shower. Technically the added shower adds value from an appraisal standpoint. But do you really want occasional dinner guests seeing inside your shower with shampoos and other implements of hygiene? Just because it is "more" doesn't make it better or best. Jury's still out on this. At present the trend is to consider it "more" at time of construction, but often pretty unsightly during the ownership of the home and at time of resale.
If a bathroom is located between 2 bedrooms, it is refered to as "a Jack & Jill bath" while a bath that s accessed from a hallway plus trhough a bedroom, is called "a continental bath"
Lots of bathroom terms but hope this is helpful especially if you are house hunting and see you see these terms used in the descrption!