IB(+)
Inner bottom strengthened for grab loading and discharging.
IB-X
Class notation for ships with cargo holds strengthened for grab handling.
ICE-05
Class notation for vessels breaking ice of 0.5 m level thickness.
ICE-10
Class notation for vessels breaking ice of 1.0 m level thickness
ICE-15
Class notation for vessels breaking ice of 1.5 m level thickness.
ICE-1A
Class notation for ships operating in ice conditions of 0.8 m level ice thickness.
ICE-1A*
Class notation for ships operating in ice conditions with ice floes of 1.0 m level ice thickness.
ICE-1A*F
Class notation for ships operating regular services in ice conditions with ice floes of 1.0 m level ice thickness.
ICE-1B
Class notation for ships operating in ice conditions with ice floes of 0.6 m level ice thickness.
ICE-1C
Class notation for ships operating in ice conditions with ice floes of 0.4 m level ice thickness.
ICE-C
Class notation for ships operating in light ice conditions.
ICE-E
Ships with ice strengthening for light localised drift ice in mouths of rivers and coastal areas.
ICM(…)
Class notation denoting an increased corrosion margin.
INERT
Systems for inerting of tanks and void spaces within the cargo area.