Drill instructor , a non-commissioned officer or Staff Non-Commissioned Officer in the armed forces or police forces with specific duties that vary by country
The D.I. (film)|The D.I. , 1957 military film by Jack Webb
Direct impingement|Direct Impingement , a class of firearm gas operation mechanism
Publications
Dagens Industri , a Swedish financial newspaper
The Daily Iowan , a student newspaper for the University of Iowa .
Music
D.I. (band)| D.I. (band) , a punk band from Southern California
* D.I. (EP)| D.I. (EP) , a 1983 EP by the same band above
Despised Icon , a Canadian deathcore band
Other
501 (number) in Roman numerals
Destination ImagiNation , an international children's problem-solving competition
DHARMA Initiative , a fictional research project
Digital Intermediate , the digital equivalent of intermediate film prints
Diplomi-insinööri , a Finnish 6-year engineering degree
Direct Ignition, see Distributor#Direct ignition
Direct Instruction , an instructional method focused on a systematic curriculum design
Disposable/Discretionary income|Disposable Income , total personal income minus personal current taxes
Document of Identity issued by the Hong Kong Immigration Department
Diameter , the distance across the middle of a circle
Disability Insurance , a form of insurance that insures the beneficiary's earned income against the risk that a disability will make working uncomfortable
