| ISU | drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart |
|---|---|
| ISU | in some classifications another name for the family Lamnidae |
| ISU | mako sharks |
| ISU | common blue-gray shark of southwest Pacific |
| ISU | very swift active bluish shark found worldwide in warm waters |
| ISU | similar to shortfin mako but darker blue |