Being a former examiner, its a term ,with which Im not familiar . The levels are/were ...
  1.. Pass 65.. 74
  2.. Comm.74.. 85
  3.. Highly comm.86..100
                      I must go on the assumption that, it infers you were above the required mark for Comm. but not quite high enough for the next level.
Normally, I would mark with a specfic percentage for clarity( As would most examiners ) .