TORA: The distance available for rolling your wheels along the surface during the take-off run.
TORR: The distance required to roll your wheels along the surface during the take-off run - or you roll of the end of the runway before getting airborne.
TODA: The distance available for rolling your wheels along the runway surface during the take-off run and and then climb to a specified height (eg 50') above the runway the surface.
TODR: The distance required to roll your wheels along the runway surface during the take-off run and and then climb to a specified height (eg 50') above the runway the surface.