What symbol in column one of the hazardous materials table Identifies a proper shipping name that is used to describe materials in international transportation?

Six different symbols may appear in Column 1:
(+) 1. Fixes the proper shipping name, hazard class and packing group to use, even if the material does not meet the hazard class definition.
(A) 2. Means the hazardous material described in Column 2 is subject to the HMR only when offered or intended for transport by air unless it is a hazardous substance or hazardous waste.
(D) 3. Means the proper shipping name is appropriate for describing materials for domestic transportation, but may not be proper for international transportation.
(G) 4. Identifies the proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses in association with the basic description.
(I) 5. Identifies a proper shipping name that is used to describe materials in international transportation. A different shipping name may be used when only domestic transportation is involved.
(W) 6. Means the hazardous material described in Column 2 is subject to the HMR only when offered or intended for transportation by water unless it is a hazardous substance, hazardous waste.