From kane (a straight reed, i.e. Rod); a rule ("canon"), i.e. (figuratively) a standard (of faith and practice); by implication, a boundary, i.e. (figuratively) a sphere (of activity) -- line, rule.

κανόνα (kanona) − 1 Occurrence

κανόνι (kanoni) − 2 Occurrences

κανόνος (kanonos) − 1 Occurrence