what means TC abbreviation in TC_STRUCT?

in the source code there is TC_STRUCT,
my question is what means TC?
the TP abbreviation means trajectory planner, but the TC abbreviation is not explained.
 

Maybe Curve?
TC represents a segment of the path.

I know that refers to a path's segment.
Yes, it is possible to mean Trajectory Curve.

TP - Trajectory Planner ( see src/emc/tp/tp.c)
TC - Trajectory Controller. (see src/emc/tp/tc.c))