T Polyamory is a term to describe a possible polyamorous relationship structure which involves three people where the third person's involvement causes the other two to be involved with each other. For example: A is dating B and C. A's involvement means that B and C also date each other. Without A's involvement, B and C would no longer date.
History
It is unknown who first coined the term, however it has been used among polyamorous groups for a number of years.
Flags
The first flag was coined by Deviantart user NonMonoPrideFlags on December 26th, 2015. Red is for passion, grey is for stability, and purple is for sensuality.
The second flag was coined by a user going by Weniviere on December 30th, 2020. The two shades of dark blue stands for unity and balance, while the two shades of light blue stands for love and bonding. The white stands for adoration and equality. The two shades of light red stand for passion, and the two shades of dark red stand for attraction of any kind.
Resources
https://www.deviantart.com/pride-flags/art/T-Polyamory-584663352