Cirion is a terran planet of the Koprulu Sector. It is known to practice a system of indentured servitude, and makes use of sweatshops. Dean Mozian of Raynor's Raiders was pulled from one of these sweatshops.
Cirion may be the home planet of the Cirion Multinational Corporation, but no confirmed connection between the two has been made.
Bogdanove, Kal-El. "The Fightin' SceeVees." (May 30, 2013). Blizzard Entertainment. StarCraft Lore: The Fightin' SceeVees Accessed 2013-05-30