Jot
or Iota, the smallest letter of the Greek alphabet, used
metaphorically or proverbially for the smallest thing (Matt.
5:18); or it may be = yod, which is the smallest of the Hebrew
letters.
Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'Jot' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.