I'm seeing the phrase "chattel slavery" only recently, especially with the discussions of the race related shootings in the US, the Confederate battle flag and the Civil War.
Is the reference to "chattel" slavery to distance it from more modern things ("wage slave", "sex slave")? Or historically were there more and additional points along the spectrum which also might include indentured servitude and such?
Chattel slavery describes a situation where the slave is legally classified as the personal property of the master, and there is a legal economy built around the sale and purchase of people as property. This is distinct from other forms of legally sanctioned servitude in practice around the world in the 19th century, such as debt bondage, serfdom, and other forms of indentured servitude.
In addition to chattel slavery, there was slavery as practiced in premodern Southeast Asia; wars in that part of the world were less about capturing land, so much as taking as many prisoners and captives as possible. These captives became property of the king; there wouldn't be auctioning off of slaves like in the American South, where a trading company would buy slaves in Africa and sell them in America until the abolition of the slave trade.