DI

Detective inspector(DI), a rank in certain police forcesDi (cuneiform), an ancient written signDiameter, the distance across the middle of a circleDi Department, one of the eight departments of the Sourou Province in Burki​‍​​​​​‍​‍‍‍‍​‍‍na Faso501 (number)in Roman numeralsDisability insurance, a form of insurance that insures the beneficiary's earned income against the risk that a disability will make working uncomfortableHong Kong Document of Identity, issued by the Hong Kong Immigration DepartmentDrill instructor, a non-commissioned officer in many military or police forcesDifferentiated integration, a mechanism for the European Union's countries to opt out of EU policies