Often refers to in the automotive sector: the ignition of the diagnostic connector, ignition diagnostic of the connector of the abbreviation. 2, in the field of legal and financial trade often means: the initial direct costs, the abbreviation of the initial the direct costs. 3, in the petrochemical industry often refers to: the instantaneous offset control, Instantaneous Deviation Control abbreviations. 4, often refers to the field of electronic engineering: intelligent disk controller, that is the abbreviation of the Intelligent Disk Controller. 5, Apple enthusiasts often say: idc i do not care abbreviation.