Defense Capabilities Initiative, a NATO initiative

Display Control Interface, a standard developed by Microsoft and Intel for device drivers that control graphics cards

Discovery Communications Inc., an American global media and entertainment company

Drum Corps International, the nonprofit organization governing modern junior drum and bugle corps

Digital Cinema Initiatives, a joint venture between the major Hollywood studios to establish a specification for a standard digital cinema architecture

Detective Chief Inspector, a police rank in the United Kingdom

Ductile cast iron, a more flexible type of cast iron

D-chiro-inositol, an isomer of inositol

Dredging Corporation of India Limited, an Indian public sector company

Dental Council of India, an organisation which regulates dental education in India

Digitally Controlled Impedance, Impedance control function in FPGA.

Director of Central Intelligence, the former title of the head of the CIA and the overall chief of U.S. intelligence; the position has now been split between the Director of the Central Intelligence Agency and the Director of National Intelligence

DCI (formerly Duelists' Convocation International), the organization that runs or sanctions official tournaments of Wizards of the Coast games

Decompression illness, a condition brought on by rapid decompression with the combination of decompression sickness ("the bends") and arterial gas embolisms; traditionally associated with diving

Dynamic Cassette International (DCI) is a Boston, Lincolnshire, UK based ink cartridge manufacturing company, producing products under the Jet Tec brand name.