Agorarelatious or Agoragamous refers to someone who is interested in having an open relationship as well as any terms that fall under this umbrella, which includes a DADT relationship, swinging relationship, and/or geographical non-monogamy.
Agorarelatious was coined by Tumblr user purrloinsucks at an unknown point of 2015.
The flag was coined by Mod Hermy and Deviantart user Pride-Flags on February 3rd of 2018. It has no confirmed meaning.
Agora is Greek for "open" specifically meaning "open spaces."