Metacentric height
The metacentric height is a measurement of the static stability of a floating body. It is calculated as the distance between the centre of gravity of a ship and its metacentre (GM). A larger metacentric height implies greater stability against overturning. Metacentric height also has implication on the natural period
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...

 of rolling of a hull, with very large metacentric heights being associated with shorter periods of roll which are uncomfortable for passengers.