Delta Air Lines, under the IATA code

Driver's license, an official document which states that a person may operate a motorized vehicle

Diogenes Laertius, Greek biographer of the philosophers

Disneyland, a theme park

Ratchet: Deadlocked, a platform/shooter video game

Dragonlance, a series of fantasy novels

Distance Learning, a field of education

Subaru DL, an automobile

Description logics, a family of knowledge representation languages

Diaper lover, a fetish

Duckworth-Lewis method, a mathematical way to calculate the target score in Cricket

Decaying Lawn, an experimental metalcore band

"Dead Letters", a 2003 album by The Rasmus

Doctor of Letters, a university degree

D. L. Hughley, an American comedian

Disabled list, a baseball tactic

Diode logic, a logic family using diodes

Drinking Liberally, a social organization that discusses politics in bars

DL envelope size, standing for Deutsche Industrie Norm Long

Dai-ichi Life, an insurance company

Data link, a computer connection for transmitting data

Download, a transfer of electronic data

Deputy Lieutenant, a British title

Double lift, sleight of hand used in card magic

Distribution list, a function of email clients

Down-low, a slang phrase

D. L. Hawkins, a fictional character from the television series Heroes

County Donegal, Ireland

550 in Roman numerals