From the Glossary of The Wheel of Time
Societies among the Aes Sedai
, to which all Aes Sedai belong. They are designated by color
Ajah, Brown Ajah
Ajah. Each follows a specific philosophy for the use of the One Power
and the purpose of Aes Sedai.
The Red Ajah bends all its energies to finding and gentling
men who are attempting to wield the One Power.
The Brown Ajah forsakes involvement
with the world and dedicates itself to seeking knowledge
Blues seek causes.
The Green is the Battle Ajah.
Yellows are healers.
Whites follow logic
Grays are negotiators
There are rumors
(hotly denied, and not safely mentioned in front of any Aes Sedai) of a Black Ajah
, dedicated to serving the Dark One