Source : Webster's Revised Unabridged Dictionary (1913)

Starting \Start"ing\,
   a. & n. from {Start}, v.

   {Starting bar} (Steam Eng.), a hand lever for working the
      values in starting an engine.

   {Starting hole}, a loophole; evasion. [Obs.]

   {Starting point}, the point from which motion begins, or from
      which anything starts.

   {Starting post}, a post, stake, barrier, or place from which
      competitors in a race start, or begin the race.

Source : WordNet®

starting post
     n : a post marking the starting point of a race (especially a
         horse race)