They simply called them Turns for Binding Coil because in a coil, each spinny thing is called a turn. More decent description:
"Turns" refers to the winding number of an electrical conductor comprising an inductor.
http://www.doitpoms.ac.uk/tlplib/cre...ges/img004.jpg
Turns.
Now, most people still call them Turns for Alexander purely out of habit since Coil was our only raid for the longest time, and possibly also didn't know why they'd call it a turn so they just went with it.
