A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Unless stated otherwise, all information herein is taken from amol2.
Inacal is a term used by Demandred for the people the Sharans captured. From the context, it is not clear what the exact translation would be, but it is likely they are people trained for some specific purpose.
"I know you went to great trouble to take some alive for me, but they would have made poor inacal. They are not raised to it, and during this war, we do not have time to train them. Killing them now is a mercy compared to what they would have had to endure" (Demandred)