another example is the ammonia molecule, which is pyramidal and contains a three-fold rotation axis as well as three mirror planes at an angle of 120° to each other. each mirror plane contains an n-h bond and bisects the h-n-h bond angle opposite to that bond. thus ammonia molecule belongs to the c3v point group which has order 6: an identity element e, two rotation operations c3 and c32, and three mirror reflections σv, σv' and σv".