- Polyfragmented: Headcount of 100+, Layered/Clusters/Subsystem, A headmate with their own (sub)system

- Median: Being neither multiple nor singlet" (Astraea, n.d.) This term replaced midcontinuum and is now functionally identical. Coined by Blackbirds in 2002.

- "Mid-Continuum - Being somewhere on the spectrum between multiple and singlet"(Dark Personalities, 2001 May 19). Synonym for median; coined by Vickis in 1997.

- Singlet: A body inhabited by one person. Coined by Astraea's ex-husband, "B.C." sometimes between 1987 and 1992. // See also, Singleton, Singletype, Singular Personality and Singular Person.

- Facet - Sometimes used to refer to median sysmembers

- Singtiple: A kind of median system, closer to the singular side of the spectrum.